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sysctl: pass kernel pointers to ->proc_handler
[mirror_ubuntu-hirsute-kernel.git] / net / ipv6 / addrconf.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * IPv6 Address [auto]configuration
4 * Linux INET6 implementation
5 *
6 * Authors:
7 * Pedro Roque <roque@di.fc.ul.pt>
8 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
9 */
10
11 /*
12 * Changes:
13 *
14 * Janos Farkas : delete timer on ifdown
15 * <chexum@bankinf.banki.hu>
16 * Andi Kleen : kill double kfree on module
17 * unload.
18 * Maciej W. Rozycki : FDDI support
19 * sekiya@USAGI : Don't send too many RS
20 * packets.
21 * yoshfuji@USAGI : Fixed interval between DAD
22 * packets.
23 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
24 * address validation timer.
25 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
26 * support.
27 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
28 * address on a same interface.
29 * YOSHIFUJI Hideaki @USAGI : ARCnet support
30 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
31 * seq_file.
32 * YOSHIFUJI Hideaki @USAGI : improved source address
33 * selection; consider scope,
34 * status etc.
35 */
36
37 #define pr_fmt(fmt) "IPv6: " fmt
38
39 #include <linux/errno.h>
40 #include <linux/types.h>
41 #include <linux/kernel.h>
42 #include <linux/sched/signal.h>
43 #include <linux/socket.h>
44 #include <linux/sockios.h>
45 #include <linux/net.h>
46 #include <linux/inet.h>
47 #include <linux/in6.h>
48 #include <linux/netdevice.h>
49 #include <linux/if_addr.h>
50 #include <linux/if_arp.h>
51 #include <linux/if_arcnet.h>
52 #include <linux/if_infiniband.h>
53 #include <linux/route.h>
54 #include <linux/inetdevice.h>
55 #include <linux/init.h>
56 #include <linux/slab.h>
57 #ifdef CONFIG_SYSCTL
58 #include <linux/sysctl.h>
59 #endif
60 #include <linux/capability.h>
61 #include <linux/delay.h>
62 #include <linux/notifier.h>
63 #include <linux/string.h>
64 #include <linux/hash.h>
65
66 #include <net/net_namespace.h>
67 #include <net/sock.h>
68 #include <net/snmp.h>
69
70 #include <net/6lowpan.h>
71 #include <net/firewire.h>
72 #include <net/ipv6.h>
73 #include <net/protocol.h>
74 #include <net/ndisc.h>
75 #include <net/ip6_route.h>
76 #include <net/addrconf.h>
77 #include <net/tcp.h>
78 #include <net/ip.h>
79 #include <net/netlink.h>
80 #include <net/pkt_sched.h>
81 #include <net/l3mdev.h>
82 #include <linux/if_tunnel.h>
83 #include <linux/rtnetlink.h>
84 #include <linux/netconf.h>
85 #include <linux/random.h>
86 #include <linux/uaccess.h>
87 #include <asm/unaligned.h>
88
89 #include <linux/proc_fs.h>
90 #include <linux/seq_file.h>
91 #include <linux/export.h>
92
93 #define INFINITY_LIFE_TIME 0xFFFFFFFF
94
95 #define IPV6_MAX_STRLEN \
96 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
97
98 static inline u32 cstamp_delta(unsigned long cstamp)
99 {
100 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
101 }
102
103 static inline s32 rfc3315_s14_backoff_init(s32 irt)
104 {
105 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
106 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
107 do_div(tmp, 1000000);
108 return (s32)tmp;
109 }
110
111 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
112 {
113 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
114 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
115 do_div(tmp, 1000000);
116 if ((s32)tmp > mrt) {
117 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
118 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
119 do_div(tmp, 1000000);
120 }
121 return (s32)tmp;
122 }
123
124 #ifdef CONFIG_SYSCTL
125 static int addrconf_sysctl_register(struct inet6_dev *idev);
126 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
127 #else
128 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
129 {
130 return 0;
131 }
132
133 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
134 {
135 }
136 #endif
137
138 static void ipv6_regen_rndid(struct inet6_dev *idev);
139 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
140
141 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
142 static int ipv6_count_addresses(const struct inet6_dev *idev);
143 static int ipv6_generate_stable_address(struct in6_addr *addr,
144 u8 dad_count,
145 const struct inet6_dev *idev);
146
147 #define IN6_ADDR_HSIZE_SHIFT 8
148 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
149 /*
150 * Configured unicast address hash table
151 */
152 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
153 static DEFINE_SPINLOCK(addrconf_hash_lock);
154
155 static void addrconf_verify(void);
156 static void addrconf_verify_rtnl(void);
157 static void addrconf_verify_work(struct work_struct *);
158
159 static struct workqueue_struct *addrconf_wq;
160 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
161
162 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
163 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
164
165 static void addrconf_type_change(struct net_device *dev,
166 unsigned long event);
167 static int addrconf_ifdown(struct net_device *dev, int how);
168
169 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
170 int plen,
171 const struct net_device *dev,
172 u32 flags, u32 noflags,
173 bool no_gw);
174
175 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
176 static void addrconf_dad_work(struct work_struct *w);
177 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
178 bool send_na);
179 static void addrconf_dad_run(struct inet6_dev *idev, bool restart);
180 static void addrconf_rs_timer(struct timer_list *t);
181 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
182 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
183
184 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
185 struct prefix_info *pinfo);
186
187 static struct ipv6_devconf ipv6_devconf __read_mostly = {
188 .forwarding = 0,
189 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
190 .mtu6 = IPV6_MIN_MTU,
191 .accept_ra = 1,
192 .accept_redirects = 1,
193 .autoconf = 1,
194 .force_mld_version = 0,
195 .mldv1_unsolicited_report_interval = 10 * HZ,
196 .mldv2_unsolicited_report_interval = HZ,
197 .dad_transmits = 1,
198 .rtr_solicits = MAX_RTR_SOLICITATIONS,
199 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
200 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
201 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
202 .use_tempaddr = 0,
203 .temp_valid_lft = TEMP_VALID_LIFETIME,
204 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
205 .regen_max_retry = REGEN_MAX_RETRY,
206 .max_desync_factor = MAX_DESYNC_FACTOR,
207 .max_addresses = IPV6_MAX_ADDRESSES,
208 .accept_ra_defrtr = 1,
209 .accept_ra_from_local = 0,
210 .accept_ra_min_hop_limit= 1,
211 .accept_ra_pinfo = 1,
212 #ifdef CONFIG_IPV6_ROUTER_PREF
213 .accept_ra_rtr_pref = 1,
214 .rtr_probe_interval = 60 * HZ,
215 #ifdef CONFIG_IPV6_ROUTE_INFO
216 .accept_ra_rt_info_min_plen = 0,
217 .accept_ra_rt_info_max_plen = 0,
218 #endif
219 #endif
220 .proxy_ndp = 0,
221 .accept_source_route = 0, /* we do not accept RH0 by default. */
222 .disable_ipv6 = 0,
223 .accept_dad = 0,
224 .suppress_frag_ndisc = 1,
225 .accept_ra_mtu = 1,
226 .stable_secret = {
227 .initialized = false,
228 },
229 .use_oif_addrs_only = 0,
230 .ignore_routes_with_linkdown = 0,
231 .keep_addr_on_down = 0,
232 .seg6_enabled = 0,
233 #ifdef CONFIG_IPV6_SEG6_HMAC
234 .seg6_require_hmac = 0,
235 #endif
236 .enhanced_dad = 1,
237 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
238 .disable_policy = 0,
239 .rpl_seg_enabled = 0,
240 };
241
242 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
243 .forwarding = 0,
244 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
245 .mtu6 = IPV6_MIN_MTU,
246 .accept_ra = 1,
247 .accept_redirects = 1,
248 .autoconf = 1,
249 .force_mld_version = 0,
250 .mldv1_unsolicited_report_interval = 10 * HZ,
251 .mldv2_unsolicited_report_interval = HZ,
252 .dad_transmits = 1,
253 .rtr_solicits = MAX_RTR_SOLICITATIONS,
254 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
255 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
256 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
257 .use_tempaddr = 0,
258 .temp_valid_lft = TEMP_VALID_LIFETIME,
259 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
260 .regen_max_retry = REGEN_MAX_RETRY,
261 .max_desync_factor = MAX_DESYNC_FACTOR,
262 .max_addresses = IPV6_MAX_ADDRESSES,
263 .accept_ra_defrtr = 1,
264 .accept_ra_from_local = 0,
265 .accept_ra_min_hop_limit= 1,
266 .accept_ra_pinfo = 1,
267 #ifdef CONFIG_IPV6_ROUTER_PREF
268 .accept_ra_rtr_pref = 1,
269 .rtr_probe_interval = 60 * HZ,
270 #ifdef CONFIG_IPV6_ROUTE_INFO
271 .accept_ra_rt_info_min_plen = 0,
272 .accept_ra_rt_info_max_plen = 0,
273 #endif
274 #endif
275 .proxy_ndp = 0,
276 .accept_source_route = 0, /* we do not accept RH0 by default. */
277 .disable_ipv6 = 0,
278 .accept_dad = 1,
279 .suppress_frag_ndisc = 1,
280 .accept_ra_mtu = 1,
281 .stable_secret = {
282 .initialized = false,
283 },
284 .use_oif_addrs_only = 0,
285 .ignore_routes_with_linkdown = 0,
286 .keep_addr_on_down = 0,
287 .seg6_enabled = 0,
288 #ifdef CONFIG_IPV6_SEG6_HMAC
289 .seg6_require_hmac = 0,
290 #endif
291 .enhanced_dad = 1,
292 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
293 .disable_policy = 0,
294 .rpl_seg_enabled = 0,
295 };
296
297 /* Check if link is ready: is it up and is a valid qdisc available */
298 static inline bool addrconf_link_ready(const struct net_device *dev)
299 {
300 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
301 }
302
303 static void addrconf_del_rs_timer(struct inet6_dev *idev)
304 {
305 if (del_timer(&idev->rs_timer))
306 __in6_dev_put(idev);
307 }
308
309 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
310 {
311 if (cancel_delayed_work(&ifp->dad_work))
312 __in6_ifa_put(ifp);
313 }
314
315 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
316 unsigned long when)
317 {
318 if (!timer_pending(&idev->rs_timer))
319 in6_dev_hold(idev);
320 mod_timer(&idev->rs_timer, jiffies + when);
321 }
322
323 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
324 unsigned long delay)
325 {
326 in6_ifa_hold(ifp);
327 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
328 in6_ifa_put(ifp);
329 }
330
331 static int snmp6_alloc_dev(struct inet6_dev *idev)
332 {
333 int i;
334
335 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
336 if (!idev->stats.ipv6)
337 goto err_ip;
338
339 for_each_possible_cpu(i) {
340 struct ipstats_mib *addrconf_stats;
341 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
342 u64_stats_init(&addrconf_stats->syncp);
343 }
344
345
346 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
347 GFP_KERNEL);
348 if (!idev->stats.icmpv6dev)
349 goto err_icmp;
350 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
351 GFP_KERNEL);
352 if (!idev->stats.icmpv6msgdev)
353 goto err_icmpmsg;
354
355 return 0;
356
357 err_icmpmsg:
358 kfree(idev->stats.icmpv6dev);
359 err_icmp:
360 free_percpu(idev->stats.ipv6);
361 err_ip:
362 return -ENOMEM;
363 }
364
365 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
366 {
367 struct inet6_dev *ndev;
368 int err = -ENOMEM;
369
370 ASSERT_RTNL();
371
372 if (dev->mtu < IPV6_MIN_MTU)
373 return ERR_PTR(-EINVAL);
374
375 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
376 if (!ndev)
377 return ERR_PTR(err);
378
379 rwlock_init(&ndev->lock);
380 ndev->dev = dev;
381 INIT_LIST_HEAD(&ndev->addr_list);
382 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
383 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
384
385 if (ndev->cnf.stable_secret.initialized)
386 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
387
388 ndev->cnf.mtu6 = dev->mtu;
389 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
390 if (!ndev->nd_parms) {
391 kfree(ndev);
392 return ERR_PTR(err);
393 }
394 if (ndev->cnf.forwarding)
395 dev_disable_lro(dev);
396 /* We refer to the device */
397 dev_hold(dev);
398
399 if (snmp6_alloc_dev(ndev) < 0) {
400 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
401 __func__);
402 neigh_parms_release(&nd_tbl, ndev->nd_parms);
403 dev_put(dev);
404 kfree(ndev);
405 return ERR_PTR(err);
406 }
407
408 if (snmp6_register_dev(ndev) < 0) {
409 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
410 __func__, dev->name);
411 goto err_release;
412 }
413
414 /* One reference from device. */
415 refcount_set(&ndev->refcnt, 1);
416
417 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
418 ndev->cnf.accept_dad = -1;
419
420 #if IS_ENABLED(CONFIG_IPV6_SIT)
421 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
422 pr_info("%s: Disabled Multicast RS\n", dev->name);
423 ndev->cnf.rtr_solicits = 0;
424 }
425 #endif
426
427 INIT_LIST_HEAD(&ndev->tempaddr_list);
428 ndev->desync_factor = U32_MAX;
429 if ((dev->flags&IFF_LOOPBACK) ||
430 dev->type == ARPHRD_TUNNEL ||
431 dev->type == ARPHRD_TUNNEL6 ||
432 dev->type == ARPHRD_SIT ||
433 dev->type == ARPHRD_NONE) {
434 ndev->cnf.use_tempaddr = -1;
435 } else
436 ipv6_regen_rndid(ndev);
437
438 ndev->token = in6addr_any;
439
440 if (netif_running(dev) && addrconf_link_ready(dev))
441 ndev->if_flags |= IF_READY;
442
443 ipv6_mc_init_dev(ndev);
444 ndev->tstamp = jiffies;
445 err = addrconf_sysctl_register(ndev);
446 if (err) {
447 ipv6_mc_destroy_dev(ndev);
448 snmp6_unregister_dev(ndev);
449 goto err_release;
450 }
451 /* protected by rtnl_lock */
452 rcu_assign_pointer(dev->ip6_ptr, ndev);
453
454 /* Join interface-local all-node multicast group */
455 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
456
457 /* Join all-node multicast group */
458 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
459
460 /* Join all-router multicast group if forwarding is set */
461 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
462 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
463
464 return ndev;
465
466 err_release:
467 neigh_parms_release(&nd_tbl, ndev->nd_parms);
468 ndev->dead = 1;
469 in6_dev_finish_destroy(ndev);
470 return ERR_PTR(err);
471 }
472
473 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
474 {
475 struct inet6_dev *idev;
476
477 ASSERT_RTNL();
478
479 idev = __in6_dev_get(dev);
480 if (!idev) {
481 idev = ipv6_add_dev(dev);
482 if (IS_ERR(idev))
483 return idev;
484 }
485
486 if (dev->flags&IFF_UP)
487 ipv6_mc_up(idev);
488 return idev;
489 }
490
491 static int inet6_netconf_msgsize_devconf(int type)
492 {
493 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
494 + nla_total_size(4); /* NETCONFA_IFINDEX */
495 bool all = false;
496
497 if (type == NETCONFA_ALL)
498 all = true;
499
500 if (all || type == NETCONFA_FORWARDING)
501 size += nla_total_size(4);
502 #ifdef CONFIG_IPV6_MROUTE
503 if (all || type == NETCONFA_MC_FORWARDING)
504 size += nla_total_size(4);
505 #endif
506 if (all || type == NETCONFA_PROXY_NEIGH)
507 size += nla_total_size(4);
508
509 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
510 size += nla_total_size(4);
511
512 return size;
513 }
514
515 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
516 struct ipv6_devconf *devconf, u32 portid,
517 u32 seq, int event, unsigned int flags,
518 int type)
519 {
520 struct nlmsghdr *nlh;
521 struct netconfmsg *ncm;
522 bool all = false;
523
524 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
525 flags);
526 if (!nlh)
527 return -EMSGSIZE;
528
529 if (type == NETCONFA_ALL)
530 all = true;
531
532 ncm = nlmsg_data(nlh);
533 ncm->ncm_family = AF_INET6;
534
535 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
536 goto nla_put_failure;
537
538 if (!devconf)
539 goto out;
540
541 if ((all || type == NETCONFA_FORWARDING) &&
542 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
543 goto nla_put_failure;
544 #ifdef CONFIG_IPV6_MROUTE
545 if ((all || type == NETCONFA_MC_FORWARDING) &&
546 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
547 devconf->mc_forwarding) < 0)
548 goto nla_put_failure;
549 #endif
550 if ((all || type == NETCONFA_PROXY_NEIGH) &&
551 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
552 goto nla_put_failure;
553
554 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
555 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
556 devconf->ignore_routes_with_linkdown) < 0)
557 goto nla_put_failure;
558
559 out:
560 nlmsg_end(skb, nlh);
561 return 0;
562
563 nla_put_failure:
564 nlmsg_cancel(skb, nlh);
565 return -EMSGSIZE;
566 }
567
568 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
569 int ifindex, struct ipv6_devconf *devconf)
570 {
571 struct sk_buff *skb;
572 int err = -ENOBUFS;
573
574 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
575 if (!skb)
576 goto errout;
577
578 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
579 event, 0, type);
580 if (err < 0) {
581 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
582 WARN_ON(err == -EMSGSIZE);
583 kfree_skb(skb);
584 goto errout;
585 }
586 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
587 return;
588 errout:
589 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
590 }
591
592 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
593 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
594 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
595 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
596 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
597 };
598
599 static int inet6_netconf_valid_get_req(struct sk_buff *skb,
600 const struct nlmsghdr *nlh,
601 struct nlattr **tb,
602 struct netlink_ext_ack *extack)
603 {
604 int i, err;
605
606 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
607 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request");
608 return -EINVAL;
609 }
610
611 if (!netlink_strict_get_check(skb))
612 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
613 tb, NETCONFA_MAX,
614 devconf_ipv6_policy, extack);
615
616 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
617 tb, NETCONFA_MAX,
618 devconf_ipv6_policy, extack);
619 if (err)
620 return err;
621
622 for (i = 0; i <= NETCONFA_MAX; i++) {
623 if (!tb[i])
624 continue;
625
626 switch (i) {
627 case NETCONFA_IFINDEX:
628 break;
629 default:
630 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
631 return -EINVAL;
632 }
633 }
634
635 return 0;
636 }
637
638 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
639 struct nlmsghdr *nlh,
640 struct netlink_ext_ack *extack)
641 {
642 struct net *net = sock_net(in_skb->sk);
643 struct nlattr *tb[NETCONFA_MAX+1];
644 struct inet6_dev *in6_dev = NULL;
645 struct net_device *dev = NULL;
646 struct sk_buff *skb;
647 struct ipv6_devconf *devconf;
648 int ifindex;
649 int err;
650
651 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack);
652 if (err < 0)
653 return err;
654
655 if (!tb[NETCONFA_IFINDEX])
656 return -EINVAL;
657
658 err = -EINVAL;
659 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
660 switch (ifindex) {
661 case NETCONFA_IFINDEX_ALL:
662 devconf = net->ipv6.devconf_all;
663 break;
664 case NETCONFA_IFINDEX_DEFAULT:
665 devconf = net->ipv6.devconf_dflt;
666 break;
667 default:
668 dev = dev_get_by_index(net, ifindex);
669 if (!dev)
670 return -EINVAL;
671 in6_dev = in6_dev_get(dev);
672 if (!in6_dev)
673 goto errout;
674 devconf = &in6_dev->cnf;
675 break;
676 }
677
678 err = -ENOBUFS;
679 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
680 if (!skb)
681 goto errout;
682
683 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
684 NETLINK_CB(in_skb).portid,
685 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
686 NETCONFA_ALL);
687 if (err < 0) {
688 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
689 WARN_ON(err == -EMSGSIZE);
690 kfree_skb(skb);
691 goto errout;
692 }
693 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
694 errout:
695 if (in6_dev)
696 in6_dev_put(in6_dev);
697 if (dev)
698 dev_put(dev);
699 return err;
700 }
701
702 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
703 struct netlink_callback *cb)
704 {
705 const struct nlmsghdr *nlh = cb->nlh;
706 struct net *net = sock_net(skb->sk);
707 int h, s_h;
708 int idx, s_idx;
709 struct net_device *dev;
710 struct inet6_dev *idev;
711 struct hlist_head *head;
712
713 if (cb->strict_check) {
714 struct netlink_ext_ack *extack = cb->extack;
715 struct netconfmsg *ncm;
716
717 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
718 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
719 return -EINVAL;
720 }
721
722 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
723 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
724 return -EINVAL;
725 }
726 }
727
728 s_h = cb->args[0];
729 s_idx = idx = cb->args[1];
730
731 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
732 idx = 0;
733 head = &net->dev_index_head[h];
734 rcu_read_lock();
735 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
736 net->dev_base_seq;
737 hlist_for_each_entry_rcu(dev, head, index_hlist) {
738 if (idx < s_idx)
739 goto cont;
740 idev = __in6_dev_get(dev);
741 if (!idev)
742 goto cont;
743
744 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
745 &idev->cnf,
746 NETLINK_CB(cb->skb).portid,
747 nlh->nlmsg_seq,
748 RTM_NEWNETCONF,
749 NLM_F_MULTI,
750 NETCONFA_ALL) < 0) {
751 rcu_read_unlock();
752 goto done;
753 }
754 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
755 cont:
756 idx++;
757 }
758 rcu_read_unlock();
759 }
760 if (h == NETDEV_HASHENTRIES) {
761 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
762 net->ipv6.devconf_all,
763 NETLINK_CB(cb->skb).portid,
764 nlh->nlmsg_seq,
765 RTM_NEWNETCONF, NLM_F_MULTI,
766 NETCONFA_ALL) < 0)
767 goto done;
768 else
769 h++;
770 }
771 if (h == NETDEV_HASHENTRIES + 1) {
772 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
773 net->ipv6.devconf_dflt,
774 NETLINK_CB(cb->skb).portid,
775 nlh->nlmsg_seq,
776 RTM_NEWNETCONF, NLM_F_MULTI,
777 NETCONFA_ALL) < 0)
778 goto done;
779 else
780 h++;
781 }
782 done:
783 cb->args[0] = h;
784 cb->args[1] = idx;
785
786 return skb->len;
787 }
788
789 #ifdef CONFIG_SYSCTL
790 static void dev_forward_change(struct inet6_dev *idev)
791 {
792 struct net_device *dev;
793 struct inet6_ifaddr *ifa;
794
795 if (!idev)
796 return;
797 dev = idev->dev;
798 if (idev->cnf.forwarding)
799 dev_disable_lro(dev);
800 if (dev->flags & IFF_MULTICAST) {
801 if (idev->cnf.forwarding) {
802 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
803 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
804 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
805 } else {
806 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
807 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
808 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
809 }
810 }
811
812 list_for_each_entry(ifa, &idev->addr_list, if_list) {
813 if (ifa->flags&IFA_F_TENTATIVE)
814 continue;
815 if (idev->cnf.forwarding)
816 addrconf_join_anycast(ifa);
817 else
818 addrconf_leave_anycast(ifa);
819 }
820 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
821 NETCONFA_FORWARDING,
822 dev->ifindex, &idev->cnf);
823 }
824
825
826 static void addrconf_forward_change(struct net *net, __s32 newf)
827 {
828 struct net_device *dev;
829 struct inet6_dev *idev;
830
831 for_each_netdev(net, dev) {
832 idev = __in6_dev_get(dev);
833 if (idev) {
834 int changed = (!idev->cnf.forwarding) ^ (!newf);
835 idev->cnf.forwarding = newf;
836 if (changed)
837 dev_forward_change(idev);
838 }
839 }
840 }
841
842 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
843 {
844 struct net *net;
845 int old;
846
847 if (!rtnl_trylock())
848 return restart_syscall();
849
850 net = (struct net *)table->extra2;
851 old = *p;
852 *p = newf;
853
854 if (p == &net->ipv6.devconf_dflt->forwarding) {
855 if ((!newf) ^ (!old))
856 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
857 NETCONFA_FORWARDING,
858 NETCONFA_IFINDEX_DEFAULT,
859 net->ipv6.devconf_dflt);
860 rtnl_unlock();
861 return 0;
862 }
863
864 if (p == &net->ipv6.devconf_all->forwarding) {
865 int old_dflt = net->ipv6.devconf_dflt->forwarding;
866
867 net->ipv6.devconf_dflt->forwarding = newf;
868 if ((!newf) ^ (!old_dflt))
869 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
870 NETCONFA_FORWARDING,
871 NETCONFA_IFINDEX_DEFAULT,
872 net->ipv6.devconf_dflt);
873
874 addrconf_forward_change(net, newf);
875 if ((!newf) ^ (!old))
876 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
877 NETCONFA_FORWARDING,
878 NETCONFA_IFINDEX_ALL,
879 net->ipv6.devconf_all);
880 } else if ((!newf) ^ (!old))
881 dev_forward_change((struct inet6_dev *)table->extra1);
882 rtnl_unlock();
883
884 if (newf)
885 rt6_purge_dflt_routers(net);
886 return 1;
887 }
888
889 static void addrconf_linkdown_change(struct net *net, __s32 newf)
890 {
891 struct net_device *dev;
892 struct inet6_dev *idev;
893
894 for_each_netdev(net, dev) {
895 idev = __in6_dev_get(dev);
896 if (idev) {
897 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
898
899 idev->cnf.ignore_routes_with_linkdown = newf;
900 if (changed)
901 inet6_netconf_notify_devconf(dev_net(dev),
902 RTM_NEWNETCONF,
903 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
904 dev->ifindex,
905 &idev->cnf);
906 }
907 }
908 }
909
910 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
911 {
912 struct net *net;
913 int old;
914
915 if (!rtnl_trylock())
916 return restart_syscall();
917
918 net = (struct net *)table->extra2;
919 old = *p;
920 *p = newf;
921
922 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
923 if ((!newf) ^ (!old))
924 inet6_netconf_notify_devconf(net,
925 RTM_NEWNETCONF,
926 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
927 NETCONFA_IFINDEX_DEFAULT,
928 net->ipv6.devconf_dflt);
929 rtnl_unlock();
930 return 0;
931 }
932
933 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
934 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
935 addrconf_linkdown_change(net, newf);
936 if ((!newf) ^ (!old))
937 inet6_netconf_notify_devconf(net,
938 RTM_NEWNETCONF,
939 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
940 NETCONFA_IFINDEX_ALL,
941 net->ipv6.devconf_all);
942 }
943 rtnl_unlock();
944
945 return 1;
946 }
947
948 #endif
949
950 /* Nobody refers to this ifaddr, destroy it */
951 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
952 {
953 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
954
955 #ifdef NET_REFCNT_DEBUG
956 pr_debug("%s\n", __func__);
957 #endif
958
959 in6_dev_put(ifp->idev);
960
961 if (cancel_delayed_work(&ifp->dad_work))
962 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
963 ifp);
964
965 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
966 pr_warn("Freeing alive inet6 address %p\n", ifp);
967 return;
968 }
969
970 kfree_rcu(ifp, rcu);
971 }
972
973 static void
974 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
975 {
976 struct list_head *p;
977 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
978
979 /*
980 * Each device address list is sorted in order of scope -
981 * global before linklocal.
982 */
983 list_for_each(p, &idev->addr_list) {
984 struct inet6_ifaddr *ifa
985 = list_entry(p, struct inet6_ifaddr, if_list);
986 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
987 break;
988 }
989
990 list_add_tail_rcu(&ifp->if_list, p);
991 }
992
993 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
994 {
995 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
996
997 return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
998 }
999
1000 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1001 struct net_device *dev, unsigned int hash)
1002 {
1003 struct inet6_ifaddr *ifp;
1004
1005 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1006 if (!net_eq(dev_net(ifp->idev->dev), net))
1007 continue;
1008 if (ipv6_addr_equal(&ifp->addr, addr)) {
1009 if (!dev || ifp->idev->dev == dev)
1010 return true;
1011 }
1012 }
1013 return false;
1014 }
1015
1016 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
1017 {
1018 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr);
1019 int err = 0;
1020
1021 spin_lock(&addrconf_hash_lock);
1022
1023 /* Ignore adding duplicate addresses on an interface */
1024 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) {
1025 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
1026 err = -EEXIST;
1027 } else {
1028 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
1029 }
1030
1031 spin_unlock(&addrconf_hash_lock);
1032
1033 return err;
1034 }
1035
1036 /* On success it returns ifp with increased reference count */
1037
1038 static struct inet6_ifaddr *
1039 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
1040 bool can_block, struct netlink_ext_ack *extack)
1041 {
1042 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
1043 int addr_type = ipv6_addr_type(cfg->pfx);
1044 struct net *net = dev_net(idev->dev);
1045 struct inet6_ifaddr *ifa = NULL;
1046 struct fib6_info *f6i = NULL;
1047 int err = 0;
1048
1049 if (addr_type == IPV6_ADDR_ANY ||
1050 (addr_type & IPV6_ADDR_MULTICAST &&
1051 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) ||
1052 (!(idev->dev->flags & IFF_LOOPBACK) &&
1053 !netif_is_l3_master(idev->dev) &&
1054 addr_type & IPV6_ADDR_LOOPBACK))
1055 return ERR_PTR(-EADDRNOTAVAIL);
1056
1057 if (idev->dead) {
1058 err = -ENODEV; /*XXX*/
1059 goto out;
1060 }
1061
1062 if (idev->cnf.disable_ipv6) {
1063 err = -EACCES;
1064 goto out;
1065 }
1066
1067 /* validator notifier needs to be blocking;
1068 * do not call in atomic context
1069 */
1070 if (can_block) {
1071 struct in6_validator_info i6vi = {
1072 .i6vi_addr = *cfg->pfx,
1073 .i6vi_dev = idev,
1074 .extack = extack,
1075 };
1076
1077 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1078 err = notifier_to_errno(err);
1079 if (err < 0)
1080 goto out;
1081 }
1082
1083 ifa = kzalloc(sizeof(*ifa), gfp_flags);
1084 if (!ifa) {
1085 err = -ENOBUFS;
1086 goto out;
1087 }
1088
1089 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags);
1090 if (IS_ERR(f6i)) {
1091 err = PTR_ERR(f6i);
1092 f6i = NULL;
1093 goto out;
1094 }
1095
1096 if (net->ipv6.devconf_all->disable_policy ||
1097 idev->cnf.disable_policy)
1098 f6i->dst_nopolicy = true;
1099
1100 neigh_parms_data_state_setall(idev->nd_parms);
1101
1102 ifa->addr = *cfg->pfx;
1103 if (cfg->peer_pfx)
1104 ifa->peer_addr = *cfg->peer_pfx;
1105
1106 spin_lock_init(&ifa->lock);
1107 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1108 INIT_HLIST_NODE(&ifa->addr_lst);
1109 ifa->scope = cfg->scope;
1110 ifa->prefix_len = cfg->plen;
1111 ifa->rt_priority = cfg->rt_priority;
1112 ifa->flags = cfg->ifa_flags;
1113 /* No need to add the TENTATIVE flag for addresses with NODAD */
1114 if (!(cfg->ifa_flags & IFA_F_NODAD))
1115 ifa->flags |= IFA_F_TENTATIVE;
1116 ifa->valid_lft = cfg->valid_lft;
1117 ifa->prefered_lft = cfg->preferred_lft;
1118 ifa->cstamp = ifa->tstamp = jiffies;
1119 ifa->tokenized = false;
1120
1121 ifa->rt = f6i;
1122
1123 ifa->idev = idev;
1124 in6_dev_hold(idev);
1125
1126 /* For caller */
1127 refcount_set(&ifa->refcnt, 1);
1128
1129 rcu_read_lock_bh();
1130
1131 err = ipv6_add_addr_hash(idev->dev, ifa);
1132 if (err < 0) {
1133 rcu_read_unlock_bh();
1134 goto out;
1135 }
1136
1137 write_lock(&idev->lock);
1138
1139 /* Add to inet6_dev unicast addr list. */
1140 ipv6_link_dev_addr(idev, ifa);
1141
1142 if (ifa->flags&IFA_F_TEMPORARY) {
1143 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1144 in6_ifa_hold(ifa);
1145 }
1146
1147 in6_ifa_hold(ifa);
1148 write_unlock(&idev->lock);
1149
1150 rcu_read_unlock_bh();
1151
1152 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1153 out:
1154 if (unlikely(err < 0)) {
1155 fib6_info_release(f6i);
1156
1157 if (ifa) {
1158 if (ifa->idev)
1159 in6_dev_put(ifa->idev);
1160 kfree(ifa);
1161 }
1162 ifa = ERR_PTR(err);
1163 }
1164
1165 return ifa;
1166 }
1167
1168 enum cleanup_prefix_rt_t {
1169 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1170 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1171 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1172 };
1173
1174 /*
1175 * Check, whether the prefix for ifp would still need a prefix route
1176 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1177 * constants.
1178 *
1179 * 1) we don't purge prefix if address was not permanent.
1180 * prefix is managed by its own lifetime.
1181 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1182 * 3) if there are no addresses, delete prefix.
1183 * 4) if there are still other permanent address(es),
1184 * corresponding prefix is still permanent.
1185 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1186 * don't purge the prefix, assume user space is managing it.
1187 * 6) otherwise, update prefix lifetime to the
1188 * longest valid lifetime among the corresponding
1189 * addresses on the device.
1190 * Note: subsequent RA will update lifetime.
1191 **/
1192 static enum cleanup_prefix_rt_t
1193 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1194 {
1195 struct inet6_ifaddr *ifa;
1196 struct inet6_dev *idev = ifp->idev;
1197 unsigned long lifetime;
1198 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1199
1200 *expires = jiffies;
1201
1202 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1203 if (ifa == ifp)
1204 continue;
1205 if (ifa->prefix_len != ifp->prefix_len ||
1206 !ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1207 ifp->prefix_len))
1208 continue;
1209 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1210 return CLEANUP_PREFIX_RT_NOP;
1211
1212 action = CLEANUP_PREFIX_RT_EXPIRE;
1213
1214 spin_lock(&ifa->lock);
1215
1216 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1217 /*
1218 * Note: Because this address is
1219 * not permanent, lifetime <
1220 * LONG_MAX / HZ here.
1221 */
1222 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1223 *expires = ifa->tstamp + lifetime * HZ;
1224 spin_unlock(&ifa->lock);
1225 }
1226
1227 return action;
1228 }
1229
1230 static void
1231 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires,
1232 bool del_rt, bool del_peer)
1233 {
1234 struct fib6_info *f6i;
1235
1236 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr,
1237 ifp->prefix_len,
1238 ifp->idev->dev, 0, RTF_DEFAULT, true);
1239 if (f6i) {
1240 if (del_rt)
1241 ip6_del_rt(dev_net(ifp->idev->dev), f6i);
1242 else {
1243 if (!(f6i->fib6_flags & RTF_EXPIRES))
1244 fib6_set_expires(f6i, expires);
1245 fib6_info_release(f6i);
1246 }
1247 }
1248 }
1249
1250
1251 /* This function wants to get referenced ifp and releases it before return */
1252
1253 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1254 {
1255 int state;
1256 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1257 unsigned long expires;
1258
1259 ASSERT_RTNL();
1260
1261 spin_lock_bh(&ifp->lock);
1262 state = ifp->state;
1263 ifp->state = INET6_IFADDR_STATE_DEAD;
1264 spin_unlock_bh(&ifp->lock);
1265
1266 if (state == INET6_IFADDR_STATE_DEAD)
1267 goto out;
1268
1269 spin_lock_bh(&addrconf_hash_lock);
1270 hlist_del_init_rcu(&ifp->addr_lst);
1271 spin_unlock_bh(&addrconf_hash_lock);
1272
1273 write_lock_bh(&ifp->idev->lock);
1274
1275 if (ifp->flags&IFA_F_TEMPORARY) {
1276 list_del(&ifp->tmp_list);
1277 if (ifp->ifpub) {
1278 in6_ifa_put(ifp->ifpub);
1279 ifp->ifpub = NULL;
1280 }
1281 __in6_ifa_put(ifp);
1282 }
1283
1284 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1285 action = check_cleanup_prefix_route(ifp, &expires);
1286
1287 list_del_rcu(&ifp->if_list);
1288 __in6_ifa_put(ifp);
1289
1290 write_unlock_bh(&ifp->idev->lock);
1291
1292 addrconf_del_dad_work(ifp);
1293
1294 ipv6_ifa_notify(RTM_DELADDR, ifp);
1295
1296 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1297
1298 if (action != CLEANUP_PREFIX_RT_NOP) {
1299 cleanup_prefix_route(ifp, expires,
1300 action == CLEANUP_PREFIX_RT_DEL, false);
1301 }
1302
1303 /* clean up prefsrc entries */
1304 rt6_remove_prefsrc(ifp);
1305 out:
1306 in6_ifa_put(ifp);
1307 }
1308
1309 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp,
1310 struct inet6_ifaddr *ift,
1311 bool block)
1312 {
1313 struct inet6_dev *idev = ifp->idev;
1314 struct in6_addr addr, *tmpaddr;
1315 unsigned long tmp_tstamp, age;
1316 unsigned long regen_advance;
1317 struct ifa6_config cfg;
1318 int ret = 0;
1319 unsigned long now = jiffies;
1320 long max_desync_factor;
1321 s32 cnf_temp_preferred_lft;
1322
1323 write_lock_bh(&idev->lock);
1324 if (ift) {
1325 spin_lock_bh(&ift->lock);
1326 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1327 spin_unlock_bh(&ift->lock);
1328 tmpaddr = &addr;
1329 } else {
1330 tmpaddr = NULL;
1331 }
1332 retry:
1333 in6_dev_hold(idev);
1334 if (idev->cnf.use_tempaddr <= 0) {
1335 write_unlock_bh(&idev->lock);
1336 pr_info("%s: use_tempaddr is disabled\n", __func__);
1337 in6_dev_put(idev);
1338 ret = -1;
1339 goto out;
1340 }
1341 spin_lock_bh(&ifp->lock);
1342 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1343 idev->cnf.use_tempaddr = -1; /*XXX*/
1344 spin_unlock_bh(&ifp->lock);
1345 write_unlock_bh(&idev->lock);
1346 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1347 __func__);
1348 in6_dev_put(idev);
1349 ret = -1;
1350 goto out;
1351 }
1352 in6_ifa_hold(ifp);
1353 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1354 ipv6_try_regen_rndid(idev, tmpaddr);
1355 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1356 age = (now - ifp->tstamp) / HZ;
1357
1358 regen_advance = idev->cnf.regen_max_retry *
1359 idev->cnf.dad_transmits *
1360 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
1361
1362 /* recalculate max_desync_factor each time and update
1363 * idev->desync_factor if it's larger
1364 */
1365 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1366 max_desync_factor = min_t(__u32,
1367 idev->cnf.max_desync_factor,
1368 cnf_temp_preferred_lft - regen_advance);
1369
1370 if (unlikely(idev->desync_factor > max_desync_factor)) {
1371 if (max_desync_factor > 0) {
1372 get_random_bytes(&idev->desync_factor,
1373 sizeof(idev->desync_factor));
1374 idev->desync_factor %= max_desync_factor;
1375 } else {
1376 idev->desync_factor = 0;
1377 }
1378 }
1379
1380 memset(&cfg, 0, sizeof(cfg));
1381 cfg.valid_lft = min_t(__u32, ifp->valid_lft,
1382 idev->cnf.temp_valid_lft + age);
1383 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1384 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft);
1385
1386 cfg.plen = ifp->prefix_len;
1387 tmp_tstamp = ifp->tstamp;
1388 spin_unlock_bh(&ifp->lock);
1389
1390 write_unlock_bh(&idev->lock);
1391
1392 /* A temporary address is created only if this calculated Preferred
1393 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1394 * an implementation must not create a temporary address with a zero
1395 * Preferred Lifetime.
1396 * Use age calculation as in addrconf_verify to avoid unnecessary
1397 * temporary addresses being generated.
1398 */
1399 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1400 if (cfg.preferred_lft <= regen_advance + age) {
1401 in6_ifa_put(ifp);
1402 in6_dev_put(idev);
1403 ret = -1;
1404 goto out;
1405 }
1406
1407 cfg.ifa_flags = IFA_F_TEMPORARY;
1408 /* set in addrconf_prefix_rcv() */
1409 if (ifp->flags & IFA_F_OPTIMISTIC)
1410 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
1411
1412 cfg.pfx = &addr;
1413 cfg.scope = ipv6_addr_scope(cfg.pfx);
1414
1415 ift = ipv6_add_addr(idev, &cfg, block, NULL);
1416 if (IS_ERR(ift)) {
1417 in6_ifa_put(ifp);
1418 in6_dev_put(idev);
1419 pr_info("%s: retry temporary address regeneration\n", __func__);
1420 tmpaddr = &addr;
1421 write_lock_bh(&idev->lock);
1422 goto retry;
1423 }
1424
1425 spin_lock_bh(&ift->lock);
1426 ift->ifpub = ifp;
1427 ift->cstamp = now;
1428 ift->tstamp = tmp_tstamp;
1429 spin_unlock_bh(&ift->lock);
1430
1431 addrconf_dad_start(ift);
1432 in6_ifa_put(ift);
1433 in6_dev_put(idev);
1434 out:
1435 return ret;
1436 }
1437
1438 /*
1439 * Choose an appropriate source address (RFC3484)
1440 */
1441 enum {
1442 IPV6_SADDR_RULE_INIT = 0,
1443 IPV6_SADDR_RULE_LOCAL,
1444 IPV6_SADDR_RULE_SCOPE,
1445 IPV6_SADDR_RULE_PREFERRED,
1446 #ifdef CONFIG_IPV6_MIP6
1447 IPV6_SADDR_RULE_HOA,
1448 #endif
1449 IPV6_SADDR_RULE_OIF,
1450 IPV6_SADDR_RULE_LABEL,
1451 IPV6_SADDR_RULE_PRIVACY,
1452 IPV6_SADDR_RULE_ORCHID,
1453 IPV6_SADDR_RULE_PREFIX,
1454 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1455 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1456 #endif
1457 IPV6_SADDR_RULE_MAX
1458 };
1459
1460 struct ipv6_saddr_score {
1461 int rule;
1462 int addr_type;
1463 struct inet6_ifaddr *ifa;
1464 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1465 int scopedist;
1466 int matchlen;
1467 };
1468
1469 struct ipv6_saddr_dst {
1470 const struct in6_addr *addr;
1471 int ifindex;
1472 int scope;
1473 int label;
1474 unsigned int prefs;
1475 };
1476
1477 static inline int ipv6_saddr_preferred(int type)
1478 {
1479 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1480 return 1;
1481 return 0;
1482 }
1483
1484 static bool ipv6_use_optimistic_addr(struct net *net,
1485 struct inet6_dev *idev)
1486 {
1487 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1488 if (!idev)
1489 return false;
1490 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1491 return false;
1492 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1493 return false;
1494
1495 return true;
1496 #else
1497 return false;
1498 #endif
1499 }
1500
1501 static bool ipv6_allow_optimistic_dad(struct net *net,
1502 struct inet6_dev *idev)
1503 {
1504 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1505 if (!idev)
1506 return false;
1507 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1508 return false;
1509
1510 return true;
1511 #else
1512 return false;
1513 #endif
1514 }
1515
1516 static int ipv6_get_saddr_eval(struct net *net,
1517 struct ipv6_saddr_score *score,
1518 struct ipv6_saddr_dst *dst,
1519 int i)
1520 {
1521 int ret;
1522
1523 if (i <= score->rule) {
1524 switch (i) {
1525 case IPV6_SADDR_RULE_SCOPE:
1526 ret = score->scopedist;
1527 break;
1528 case IPV6_SADDR_RULE_PREFIX:
1529 ret = score->matchlen;
1530 break;
1531 default:
1532 ret = !!test_bit(i, score->scorebits);
1533 }
1534 goto out;
1535 }
1536
1537 switch (i) {
1538 case IPV6_SADDR_RULE_INIT:
1539 /* Rule 0: remember if hiscore is not ready yet */
1540 ret = !!score->ifa;
1541 break;
1542 case IPV6_SADDR_RULE_LOCAL:
1543 /* Rule 1: Prefer same address */
1544 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1545 break;
1546 case IPV6_SADDR_RULE_SCOPE:
1547 /* Rule 2: Prefer appropriate scope
1548 *
1549 * ret
1550 * ^
1551 * -1 | d 15
1552 * ---+--+-+---> scope
1553 * |
1554 * | d is scope of the destination.
1555 * B-d | \
1556 * | \ <- smaller scope is better if
1557 * B-15 | \ if scope is enough for destination.
1558 * | ret = B - scope (-1 <= scope >= d <= 15).
1559 * d-C-1 | /
1560 * |/ <- greater is better
1561 * -C / if scope is not enough for destination.
1562 * /| ret = scope - C (-1 <= d < scope <= 15).
1563 *
1564 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1565 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1566 * Assume B = 0 and we get C > 29.
1567 */
1568 ret = __ipv6_addr_src_scope(score->addr_type);
1569 if (ret >= dst->scope)
1570 ret = -ret;
1571 else
1572 ret -= 128; /* 30 is enough */
1573 score->scopedist = ret;
1574 break;
1575 case IPV6_SADDR_RULE_PREFERRED:
1576 {
1577 /* Rule 3: Avoid deprecated and optimistic addresses */
1578 u8 avoid = IFA_F_DEPRECATED;
1579
1580 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
1581 avoid |= IFA_F_OPTIMISTIC;
1582 ret = ipv6_saddr_preferred(score->addr_type) ||
1583 !(score->ifa->flags & avoid);
1584 break;
1585 }
1586 #ifdef CONFIG_IPV6_MIP6
1587 case IPV6_SADDR_RULE_HOA:
1588 {
1589 /* Rule 4: Prefer home address */
1590 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1591 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1592 break;
1593 }
1594 #endif
1595 case IPV6_SADDR_RULE_OIF:
1596 /* Rule 5: Prefer outgoing interface */
1597 ret = (!dst->ifindex ||
1598 dst->ifindex == score->ifa->idev->dev->ifindex);
1599 break;
1600 case IPV6_SADDR_RULE_LABEL:
1601 /* Rule 6: Prefer matching label */
1602 ret = ipv6_addr_label(net,
1603 &score->ifa->addr, score->addr_type,
1604 score->ifa->idev->dev->ifindex) == dst->label;
1605 break;
1606 case IPV6_SADDR_RULE_PRIVACY:
1607 {
1608 /* Rule 7: Prefer public address
1609 * Note: prefer temporary address if use_tempaddr >= 2
1610 */
1611 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1612 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1613 score->ifa->idev->cnf.use_tempaddr >= 2;
1614 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1615 break;
1616 }
1617 case IPV6_SADDR_RULE_ORCHID:
1618 /* Rule 8-: Prefer ORCHID vs ORCHID or
1619 * non-ORCHID vs non-ORCHID
1620 */
1621 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1622 ipv6_addr_orchid(dst->addr));
1623 break;
1624 case IPV6_SADDR_RULE_PREFIX:
1625 /* Rule 8: Use longest matching prefix */
1626 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1627 if (ret > score->ifa->prefix_len)
1628 ret = score->ifa->prefix_len;
1629 score->matchlen = ret;
1630 break;
1631 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1632 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1633 /* Optimistic addresses still have lower precedence than other
1634 * preferred addresses.
1635 */
1636 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1637 break;
1638 #endif
1639 default:
1640 ret = 0;
1641 }
1642
1643 if (ret)
1644 __set_bit(i, score->scorebits);
1645 score->rule = i;
1646 out:
1647 return ret;
1648 }
1649
1650 static int __ipv6_dev_get_saddr(struct net *net,
1651 struct ipv6_saddr_dst *dst,
1652 struct inet6_dev *idev,
1653 struct ipv6_saddr_score *scores,
1654 int hiscore_idx)
1655 {
1656 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1657
1658 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
1659 int i;
1660
1661 /*
1662 * - Tentative Address (RFC2462 section 5.4)
1663 * - A tentative address is not considered
1664 * "assigned to an interface" in the traditional
1665 * sense, unless it is also flagged as optimistic.
1666 * - Candidate Source Address (section 4)
1667 * - In any case, anycast addresses, multicast
1668 * addresses, and the unspecified address MUST
1669 * NOT be included in a candidate set.
1670 */
1671 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1672 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1673 continue;
1674
1675 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1676
1677 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1678 score->addr_type & IPV6_ADDR_MULTICAST)) {
1679 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1680 idev->dev->name);
1681 continue;
1682 }
1683
1684 score->rule = -1;
1685 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1686
1687 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1688 int minihiscore, miniscore;
1689
1690 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1691 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1692
1693 if (minihiscore > miniscore) {
1694 if (i == IPV6_SADDR_RULE_SCOPE &&
1695 score->scopedist > 0) {
1696 /*
1697 * special case:
1698 * each remaining entry
1699 * has too small (not enough)
1700 * scope, because ifa entries
1701 * are sorted by their scope
1702 * values.
1703 */
1704 goto out;
1705 }
1706 break;
1707 } else if (minihiscore < miniscore) {
1708 swap(hiscore, score);
1709 hiscore_idx = 1 - hiscore_idx;
1710
1711 /* restore our iterator */
1712 score->ifa = hiscore->ifa;
1713
1714 break;
1715 }
1716 }
1717 }
1718 out:
1719 return hiscore_idx;
1720 }
1721
1722 static int ipv6_get_saddr_master(struct net *net,
1723 const struct net_device *dst_dev,
1724 const struct net_device *master,
1725 struct ipv6_saddr_dst *dst,
1726 struct ipv6_saddr_score *scores,
1727 int hiscore_idx)
1728 {
1729 struct inet6_dev *idev;
1730
1731 idev = __in6_dev_get(dst_dev);
1732 if (idev)
1733 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1734 scores, hiscore_idx);
1735
1736 idev = __in6_dev_get(master);
1737 if (idev)
1738 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1739 scores, hiscore_idx);
1740
1741 return hiscore_idx;
1742 }
1743
1744 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1745 const struct in6_addr *daddr, unsigned int prefs,
1746 struct in6_addr *saddr)
1747 {
1748 struct ipv6_saddr_score scores[2], *hiscore;
1749 struct ipv6_saddr_dst dst;
1750 struct inet6_dev *idev;
1751 struct net_device *dev;
1752 int dst_type;
1753 bool use_oif_addr = false;
1754 int hiscore_idx = 0;
1755 int ret = 0;
1756
1757 dst_type = __ipv6_addr_type(daddr);
1758 dst.addr = daddr;
1759 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1760 dst.scope = __ipv6_addr_src_scope(dst_type);
1761 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1762 dst.prefs = prefs;
1763
1764 scores[hiscore_idx].rule = -1;
1765 scores[hiscore_idx].ifa = NULL;
1766
1767 rcu_read_lock();
1768
1769 /* Candidate Source Address (section 4)
1770 * - multicast and link-local destination address,
1771 * the set of candidate source address MUST only
1772 * include addresses assigned to interfaces
1773 * belonging to the same link as the outgoing
1774 * interface.
1775 * (- For site-local destination addresses, the
1776 * set of candidate source addresses MUST only
1777 * include addresses assigned to interfaces
1778 * belonging to the same site as the outgoing
1779 * interface.)
1780 * - "It is RECOMMENDED that the candidate source addresses
1781 * be the set of unicast addresses assigned to the
1782 * interface that will be used to send to the destination
1783 * (the 'outgoing' interface)." (RFC 6724)
1784 */
1785 if (dst_dev) {
1786 idev = __in6_dev_get(dst_dev);
1787 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1788 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1789 (idev && idev->cnf.use_oif_addrs_only)) {
1790 use_oif_addr = true;
1791 }
1792 }
1793
1794 if (use_oif_addr) {
1795 if (idev)
1796 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1797 } else {
1798 const struct net_device *master;
1799 int master_idx = 0;
1800
1801 /* if dst_dev exists and is enslaved to an L3 device, then
1802 * prefer addresses from dst_dev and then the master over
1803 * any other enslaved devices in the L3 domain.
1804 */
1805 master = l3mdev_master_dev_rcu(dst_dev);
1806 if (master) {
1807 master_idx = master->ifindex;
1808
1809 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1810 master, &dst,
1811 scores, hiscore_idx);
1812
1813 if (scores[hiscore_idx].ifa)
1814 goto out;
1815 }
1816
1817 for_each_netdev_rcu(net, dev) {
1818 /* only consider addresses on devices in the
1819 * same L3 domain
1820 */
1821 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1822 continue;
1823 idev = __in6_dev_get(dev);
1824 if (!idev)
1825 continue;
1826 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1827 }
1828 }
1829
1830 out:
1831 hiscore = &scores[hiscore_idx];
1832 if (!hiscore->ifa)
1833 ret = -EADDRNOTAVAIL;
1834 else
1835 *saddr = hiscore->ifa->addr;
1836
1837 rcu_read_unlock();
1838 return ret;
1839 }
1840 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1841
1842 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1843 u32 banned_flags)
1844 {
1845 struct inet6_ifaddr *ifp;
1846 int err = -EADDRNOTAVAIL;
1847
1848 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1849 if (ifp->scope > IFA_LINK)
1850 break;
1851 if (ifp->scope == IFA_LINK &&
1852 !(ifp->flags & banned_flags)) {
1853 *addr = ifp->addr;
1854 err = 0;
1855 break;
1856 }
1857 }
1858 return err;
1859 }
1860
1861 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1862 u32 banned_flags)
1863 {
1864 struct inet6_dev *idev;
1865 int err = -EADDRNOTAVAIL;
1866
1867 rcu_read_lock();
1868 idev = __in6_dev_get(dev);
1869 if (idev) {
1870 read_lock_bh(&idev->lock);
1871 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1872 read_unlock_bh(&idev->lock);
1873 }
1874 rcu_read_unlock();
1875 return err;
1876 }
1877
1878 static int ipv6_count_addresses(const struct inet6_dev *idev)
1879 {
1880 const struct inet6_ifaddr *ifp;
1881 int cnt = 0;
1882
1883 rcu_read_lock();
1884 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1885 cnt++;
1886 rcu_read_unlock();
1887 return cnt;
1888 }
1889
1890 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1891 const struct net_device *dev, int strict)
1892 {
1893 return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1894 strict, IFA_F_TENTATIVE);
1895 }
1896 EXPORT_SYMBOL(ipv6_chk_addr);
1897
1898 /* device argument is used to find the L3 domain of interest. If
1899 * skip_dev_check is set, then the ifp device is not checked against
1900 * the passed in dev argument. So the 2 cases for addresses checks are:
1901 * 1. does the address exist in the L3 domain that dev is part of
1902 * (skip_dev_check = true), or
1903 *
1904 * 2. does the address exist on the specific device
1905 * (skip_dev_check = false)
1906 */
1907 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1908 const struct net_device *dev, bool skip_dev_check,
1909 int strict, u32 banned_flags)
1910 {
1911 unsigned int hash = inet6_addr_hash(net, addr);
1912 const struct net_device *l3mdev;
1913 struct inet6_ifaddr *ifp;
1914 u32 ifp_flags;
1915
1916 rcu_read_lock();
1917
1918 l3mdev = l3mdev_master_dev_rcu(dev);
1919 if (skip_dev_check)
1920 dev = NULL;
1921
1922 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1923 if (!net_eq(dev_net(ifp->idev->dev), net))
1924 continue;
1925
1926 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev)
1927 continue;
1928
1929 /* Decouple optimistic from tentative for evaluation here.
1930 * Ban optimistic addresses explicitly, when required.
1931 */
1932 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1933 ? (ifp->flags&~IFA_F_TENTATIVE)
1934 : ifp->flags;
1935 if (ipv6_addr_equal(&ifp->addr, addr) &&
1936 !(ifp_flags&banned_flags) &&
1937 (!dev || ifp->idev->dev == dev ||
1938 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1939 rcu_read_unlock();
1940 return 1;
1941 }
1942 }
1943
1944 rcu_read_unlock();
1945 return 0;
1946 }
1947 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1948
1949
1950 /* Compares an address/prefix_len with addresses on device @dev.
1951 * If one is found it returns true.
1952 */
1953 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1954 const unsigned int prefix_len, struct net_device *dev)
1955 {
1956 const struct inet6_ifaddr *ifa;
1957 const struct inet6_dev *idev;
1958 bool ret = false;
1959
1960 rcu_read_lock();
1961 idev = __in6_dev_get(dev);
1962 if (idev) {
1963 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1964 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1965 if (ret)
1966 break;
1967 }
1968 }
1969 rcu_read_unlock();
1970
1971 return ret;
1972 }
1973 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1974
1975 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1976 {
1977 const struct inet6_ifaddr *ifa;
1978 const struct inet6_dev *idev;
1979 int onlink;
1980
1981 onlink = 0;
1982 rcu_read_lock();
1983 idev = __in6_dev_get(dev);
1984 if (idev) {
1985 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1986 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1987 ifa->prefix_len);
1988 if (onlink)
1989 break;
1990 }
1991 }
1992 rcu_read_unlock();
1993 return onlink;
1994 }
1995 EXPORT_SYMBOL(ipv6_chk_prefix);
1996
1997 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1998 struct net_device *dev, int strict)
1999 {
2000 unsigned int hash = inet6_addr_hash(net, addr);
2001 struct inet6_ifaddr *ifp, *result = NULL;
2002
2003 rcu_read_lock();
2004 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
2005 if (!net_eq(dev_net(ifp->idev->dev), net))
2006 continue;
2007 if (ipv6_addr_equal(&ifp->addr, addr)) {
2008 if (!dev || ifp->idev->dev == dev ||
2009 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
2010 result = ifp;
2011 in6_ifa_hold(ifp);
2012 break;
2013 }
2014 }
2015 }
2016 rcu_read_unlock();
2017
2018 return result;
2019 }
2020
2021 /* Gets referenced address, destroys ifaddr */
2022
2023 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
2024 {
2025 if (dad_failed)
2026 ifp->flags |= IFA_F_DADFAILED;
2027
2028 if (ifp->flags&IFA_F_TEMPORARY) {
2029 struct inet6_ifaddr *ifpub;
2030 spin_lock_bh(&ifp->lock);
2031 ifpub = ifp->ifpub;
2032 if (ifpub) {
2033 in6_ifa_hold(ifpub);
2034 spin_unlock_bh(&ifp->lock);
2035 ipv6_create_tempaddr(ifpub, ifp, true);
2036 in6_ifa_put(ifpub);
2037 } else {
2038 spin_unlock_bh(&ifp->lock);
2039 }
2040 ipv6_del_addr(ifp);
2041 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
2042 spin_lock_bh(&ifp->lock);
2043 addrconf_del_dad_work(ifp);
2044 ifp->flags |= IFA_F_TENTATIVE;
2045 if (dad_failed)
2046 ifp->flags &= ~IFA_F_OPTIMISTIC;
2047 spin_unlock_bh(&ifp->lock);
2048 if (dad_failed)
2049 ipv6_ifa_notify(0, ifp);
2050 in6_ifa_put(ifp);
2051 } else {
2052 ipv6_del_addr(ifp);
2053 }
2054 }
2055
2056 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2057 {
2058 int err = -ENOENT;
2059
2060 spin_lock_bh(&ifp->lock);
2061 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2062 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2063 err = 0;
2064 }
2065 spin_unlock_bh(&ifp->lock);
2066
2067 return err;
2068 }
2069
2070 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
2071 {
2072 struct inet6_dev *idev = ifp->idev;
2073 struct net *net = dev_net(ifp->idev->dev);
2074
2075 if (addrconf_dad_end(ifp)) {
2076 in6_ifa_put(ifp);
2077 return;
2078 }
2079
2080 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2081 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
2082
2083 spin_lock_bh(&ifp->lock);
2084
2085 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2086 struct in6_addr new_addr;
2087 struct inet6_ifaddr *ifp2;
2088 int retries = ifp->stable_privacy_retry + 1;
2089 struct ifa6_config cfg = {
2090 .pfx = &new_addr,
2091 .plen = ifp->prefix_len,
2092 .ifa_flags = ifp->flags,
2093 .valid_lft = ifp->valid_lft,
2094 .preferred_lft = ifp->prefered_lft,
2095 .scope = ifp->scope,
2096 };
2097
2098 if (retries > net->ipv6.sysctl.idgen_retries) {
2099 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2100 ifp->idev->dev->name);
2101 goto errdad;
2102 }
2103
2104 new_addr = ifp->addr;
2105 if (ipv6_generate_stable_address(&new_addr, retries,
2106 idev))
2107 goto errdad;
2108
2109 spin_unlock_bh(&ifp->lock);
2110
2111 if (idev->cnf.max_addresses &&
2112 ipv6_count_addresses(idev) >=
2113 idev->cnf.max_addresses)
2114 goto lock_errdad;
2115
2116 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2117 ifp->idev->dev->name);
2118
2119 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
2120 if (IS_ERR(ifp2))
2121 goto lock_errdad;
2122
2123 spin_lock_bh(&ifp2->lock);
2124 ifp2->stable_privacy_retry = retries;
2125 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2126 spin_unlock_bh(&ifp2->lock);
2127
2128 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2129 in6_ifa_put(ifp2);
2130 lock_errdad:
2131 spin_lock_bh(&ifp->lock);
2132 }
2133
2134 errdad:
2135 /* transition from _POSTDAD to _ERRDAD */
2136 ifp->state = INET6_IFADDR_STATE_ERRDAD;
2137 spin_unlock_bh(&ifp->lock);
2138
2139 addrconf_mod_dad_work(ifp, 0);
2140 in6_ifa_put(ifp);
2141 }
2142
2143 /* Join to solicited addr multicast group.
2144 * caller must hold RTNL */
2145 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2146 {
2147 struct in6_addr maddr;
2148
2149 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2150 return;
2151
2152 addrconf_addr_solict_mult(addr, &maddr);
2153 ipv6_dev_mc_inc(dev, &maddr);
2154 }
2155
2156 /* caller must hold RTNL */
2157 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2158 {
2159 struct in6_addr maddr;
2160
2161 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2162 return;
2163
2164 addrconf_addr_solict_mult(addr, &maddr);
2165 __ipv6_dev_mc_dec(idev, &maddr);
2166 }
2167
2168 /* caller must hold RTNL */
2169 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2170 {
2171 struct in6_addr addr;
2172
2173 if (ifp->prefix_len >= 127) /* RFC 6164 */
2174 return;
2175 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2176 if (ipv6_addr_any(&addr))
2177 return;
2178 __ipv6_dev_ac_inc(ifp->idev, &addr);
2179 }
2180
2181 /* caller must hold RTNL */
2182 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2183 {
2184 struct in6_addr addr;
2185
2186 if (ifp->prefix_len >= 127) /* RFC 6164 */
2187 return;
2188 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2189 if (ipv6_addr_any(&addr))
2190 return;
2191 __ipv6_dev_ac_dec(ifp->idev, &addr);
2192 }
2193
2194 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2195 {
2196 switch (dev->addr_len) {
2197 case ETH_ALEN:
2198 memcpy(eui, dev->dev_addr, 3);
2199 eui[3] = 0xFF;
2200 eui[4] = 0xFE;
2201 memcpy(eui + 5, dev->dev_addr + 3, 3);
2202 break;
2203 case EUI64_ADDR_LEN:
2204 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2205 eui[0] ^= 2;
2206 break;
2207 default:
2208 return -1;
2209 }
2210
2211 return 0;
2212 }
2213
2214 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2215 {
2216 union fwnet_hwaddr *ha;
2217
2218 if (dev->addr_len != FWNET_ALEN)
2219 return -1;
2220
2221 ha = (union fwnet_hwaddr *)dev->dev_addr;
2222
2223 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2224 eui[0] ^= 2;
2225 return 0;
2226 }
2227
2228 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2229 {
2230 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2231 if (dev->addr_len != ARCNET_ALEN)
2232 return -1;
2233 memset(eui, 0, 7);
2234 eui[7] = *(u8 *)dev->dev_addr;
2235 return 0;
2236 }
2237
2238 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2239 {
2240 if (dev->addr_len != INFINIBAND_ALEN)
2241 return -1;
2242 memcpy(eui, dev->dev_addr + 12, 8);
2243 eui[0] |= 2;
2244 return 0;
2245 }
2246
2247 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2248 {
2249 if (addr == 0)
2250 return -1;
2251 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2252 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2253 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2254 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2255 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2256 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2257 eui[1] = 0;
2258 eui[2] = 0x5E;
2259 eui[3] = 0xFE;
2260 memcpy(eui + 4, &addr, 4);
2261 return 0;
2262 }
2263
2264 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2265 {
2266 if (dev->priv_flags & IFF_ISATAP)
2267 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2268 return -1;
2269 }
2270
2271 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2272 {
2273 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2274 }
2275
2276 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2277 {
2278 memcpy(eui, dev->perm_addr, 3);
2279 memcpy(eui + 5, dev->perm_addr + 3, 3);
2280 eui[3] = 0xFF;
2281 eui[4] = 0xFE;
2282 eui[0] ^= 2;
2283 return 0;
2284 }
2285
2286 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2287 {
2288 switch (dev->type) {
2289 case ARPHRD_ETHER:
2290 case ARPHRD_FDDI:
2291 return addrconf_ifid_eui48(eui, dev);
2292 case ARPHRD_ARCNET:
2293 return addrconf_ifid_arcnet(eui, dev);
2294 case ARPHRD_INFINIBAND:
2295 return addrconf_ifid_infiniband(eui, dev);
2296 case ARPHRD_SIT:
2297 return addrconf_ifid_sit(eui, dev);
2298 case ARPHRD_IPGRE:
2299 case ARPHRD_TUNNEL:
2300 return addrconf_ifid_gre(eui, dev);
2301 case ARPHRD_6LOWPAN:
2302 return addrconf_ifid_6lowpan(eui, dev);
2303 case ARPHRD_IEEE1394:
2304 return addrconf_ifid_ieee1394(eui, dev);
2305 case ARPHRD_TUNNEL6:
2306 case ARPHRD_IP6GRE:
2307 case ARPHRD_RAWIP:
2308 return addrconf_ifid_ip6tnl(eui, dev);
2309 }
2310 return -1;
2311 }
2312
2313 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2314 {
2315 int err = -1;
2316 struct inet6_ifaddr *ifp;
2317
2318 read_lock_bh(&idev->lock);
2319 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2320 if (ifp->scope > IFA_LINK)
2321 break;
2322 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2323 memcpy(eui, ifp->addr.s6_addr+8, 8);
2324 err = 0;
2325 break;
2326 }
2327 }
2328 read_unlock_bh(&idev->lock);
2329 return err;
2330 }
2331
2332 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2333 static void ipv6_regen_rndid(struct inet6_dev *idev)
2334 {
2335 regen:
2336 get_random_bytes(idev->rndid, sizeof(idev->rndid));
2337 idev->rndid[0] &= ~0x02;
2338
2339 /*
2340 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2341 * check if generated address is not inappropriate
2342 *
2343 * - Reserved subnet anycast (RFC 2526)
2344 * 11111101 11....11 1xxxxxxx
2345 * - ISATAP (RFC4214) 6.1
2346 * 00-00-5E-FE-xx-xx-xx-xx
2347 * - value 0
2348 * - XXX: already assigned to an address on the device
2349 */
2350 if (idev->rndid[0] == 0xfd &&
2351 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2352 (idev->rndid[7]&0x80))
2353 goto regen;
2354 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2355 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2356 goto regen;
2357 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2358 goto regen;
2359 }
2360 }
2361
2362 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2363 {
2364 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2365 ipv6_regen_rndid(idev);
2366 }
2367
2368 /*
2369 * Add prefix route.
2370 */
2371
2372 static void
2373 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2374 struct net_device *dev, unsigned long expires,
2375 u32 flags, gfp_t gfp_flags)
2376 {
2377 struct fib6_config cfg = {
2378 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2379 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
2380 .fc_ifindex = dev->ifindex,
2381 .fc_expires = expires,
2382 .fc_dst_len = plen,
2383 .fc_flags = RTF_UP | flags,
2384 .fc_nlinfo.nl_net = dev_net(dev),
2385 .fc_protocol = RTPROT_KERNEL,
2386 .fc_type = RTN_UNICAST,
2387 };
2388
2389 cfg.fc_dst = *pfx;
2390
2391 /* Prevent useless cloning on PtP SIT.
2392 This thing is done here expecting that the whole
2393 class of non-broadcast devices need not cloning.
2394 */
2395 #if IS_ENABLED(CONFIG_IPV6_SIT)
2396 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2397 cfg.fc_flags |= RTF_NONEXTHOP;
2398 #endif
2399
2400 ip6_route_add(&cfg, gfp_flags, NULL);
2401 }
2402
2403
2404 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2405 int plen,
2406 const struct net_device *dev,
2407 u32 flags, u32 noflags,
2408 bool no_gw)
2409 {
2410 struct fib6_node *fn;
2411 struct fib6_info *rt = NULL;
2412 struct fib6_table *table;
2413 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2414
2415 table = fib6_get_table(dev_net(dev), tb_id);
2416 if (!table)
2417 return NULL;
2418
2419 rcu_read_lock();
2420 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
2421 if (!fn)
2422 goto out;
2423
2424 for_each_fib6_node_rt_rcu(fn) {
2425 /* prefix routes only use builtin fib6_nh */
2426 if (rt->nh)
2427 continue;
2428
2429 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex)
2430 continue;
2431 if (no_gw && rt->fib6_nh->fib_nh_gw_family)
2432 continue;
2433 if ((rt->fib6_flags & flags) != flags)
2434 continue;
2435 if ((rt->fib6_flags & noflags) != 0)
2436 continue;
2437 if (!fib6_info_hold_safe(rt))
2438 continue;
2439 break;
2440 }
2441 out:
2442 rcu_read_unlock();
2443 return rt;
2444 }
2445
2446
2447 /* Create "default" multicast route to the interface */
2448
2449 static void addrconf_add_mroute(struct net_device *dev)
2450 {
2451 struct fib6_config cfg = {
2452 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2453 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2454 .fc_ifindex = dev->ifindex,
2455 .fc_dst_len = 8,
2456 .fc_flags = RTF_UP,
2457 .fc_type = RTN_UNICAST,
2458 .fc_nlinfo.nl_net = dev_net(dev),
2459 };
2460
2461 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2462
2463 ip6_route_add(&cfg, GFP_KERNEL, NULL);
2464 }
2465
2466 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2467 {
2468 struct inet6_dev *idev;
2469
2470 ASSERT_RTNL();
2471
2472 idev = ipv6_find_idev(dev);
2473 if (IS_ERR(idev))
2474 return idev;
2475
2476 if (idev->cnf.disable_ipv6)
2477 return ERR_PTR(-EACCES);
2478
2479 /* Add default multicast route */
2480 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2481 addrconf_add_mroute(dev);
2482
2483 return idev;
2484 }
2485
2486 static void manage_tempaddrs(struct inet6_dev *idev,
2487 struct inet6_ifaddr *ifp,
2488 __u32 valid_lft, __u32 prefered_lft,
2489 bool create, unsigned long now)
2490 {
2491 u32 flags;
2492 struct inet6_ifaddr *ift;
2493
2494 read_lock_bh(&idev->lock);
2495 /* update all temporary addresses in the list */
2496 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2497 int age, max_valid, max_prefered;
2498
2499 if (ifp != ift->ifpub)
2500 continue;
2501
2502 /* RFC 4941 section 3.3:
2503 * If a received option will extend the lifetime of a public
2504 * address, the lifetimes of temporary addresses should
2505 * be extended, subject to the overall constraint that no
2506 * temporary addresses should ever remain "valid" or "preferred"
2507 * for a time longer than (TEMP_VALID_LIFETIME) or
2508 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2509 */
2510 age = (now - ift->cstamp) / HZ;
2511 max_valid = idev->cnf.temp_valid_lft - age;
2512 if (max_valid < 0)
2513 max_valid = 0;
2514
2515 max_prefered = idev->cnf.temp_prefered_lft -
2516 idev->desync_factor - age;
2517 if (max_prefered < 0)
2518 max_prefered = 0;
2519
2520 if (valid_lft > max_valid)
2521 valid_lft = max_valid;
2522
2523 if (prefered_lft > max_prefered)
2524 prefered_lft = max_prefered;
2525
2526 spin_lock(&ift->lock);
2527 flags = ift->flags;
2528 ift->valid_lft = valid_lft;
2529 ift->prefered_lft = prefered_lft;
2530 ift->tstamp = now;
2531 if (prefered_lft > 0)
2532 ift->flags &= ~IFA_F_DEPRECATED;
2533
2534 spin_unlock(&ift->lock);
2535 if (!(flags&IFA_F_TENTATIVE))
2536 ipv6_ifa_notify(0, ift);
2537 }
2538
2539 if ((create || list_empty(&idev->tempaddr_list)) &&
2540 idev->cnf.use_tempaddr > 0) {
2541 /* When a new public address is created as described
2542 * in [ADDRCONF], also create a new temporary address.
2543 * Also create a temporary address if it's enabled but
2544 * no temporary address currently exists.
2545 */
2546 read_unlock_bh(&idev->lock);
2547 ipv6_create_tempaddr(ifp, NULL, false);
2548 } else {
2549 read_unlock_bh(&idev->lock);
2550 }
2551 }
2552
2553 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2554 {
2555 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2556 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2557 }
2558
2559 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2560 const struct prefix_info *pinfo,
2561 struct inet6_dev *in6_dev,
2562 const struct in6_addr *addr, int addr_type,
2563 u32 addr_flags, bool sllao, bool tokenized,
2564 __u32 valid_lft, u32 prefered_lft)
2565 {
2566 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2567 int create = 0, update_lft = 0;
2568
2569 if (!ifp && valid_lft) {
2570 int max_addresses = in6_dev->cnf.max_addresses;
2571 struct ifa6_config cfg = {
2572 .pfx = addr,
2573 .plen = pinfo->prefix_len,
2574 .ifa_flags = addr_flags,
2575 .valid_lft = valid_lft,
2576 .preferred_lft = prefered_lft,
2577 .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2578 };
2579
2580 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2581 if ((net->ipv6.devconf_all->optimistic_dad ||
2582 in6_dev->cnf.optimistic_dad) &&
2583 !net->ipv6.devconf_all->forwarding && sllao)
2584 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
2585 #endif
2586
2587 /* Do not allow to create too much of autoconfigured
2588 * addresses; this would be too easy way to crash kernel.
2589 */
2590 if (!max_addresses ||
2591 ipv6_count_addresses(in6_dev) < max_addresses)
2592 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
2593
2594 if (IS_ERR_OR_NULL(ifp))
2595 return -1;
2596
2597 create = 1;
2598 spin_lock_bh(&ifp->lock);
2599 ifp->flags |= IFA_F_MANAGETEMPADDR;
2600 ifp->cstamp = jiffies;
2601 ifp->tokenized = tokenized;
2602 spin_unlock_bh(&ifp->lock);
2603 addrconf_dad_start(ifp);
2604 }
2605
2606 if (ifp) {
2607 u32 flags;
2608 unsigned long now;
2609 u32 stored_lft;
2610
2611 /* update lifetime (RFC2462 5.5.3 e) */
2612 spin_lock_bh(&ifp->lock);
2613 now = jiffies;
2614 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2615 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2616 else
2617 stored_lft = 0;
2618 if (!create && stored_lft) {
2619 const u32 minimum_lft = min_t(u32,
2620 stored_lft, MIN_VALID_LIFETIME);
2621 valid_lft = max(valid_lft, minimum_lft);
2622
2623 /* RFC4862 Section 5.5.3e:
2624 * "Note that the preferred lifetime of the
2625 * corresponding address is always reset to
2626 * the Preferred Lifetime in the received
2627 * Prefix Information option, regardless of
2628 * whether the valid lifetime is also reset or
2629 * ignored."
2630 *
2631 * So we should always update prefered_lft here.
2632 */
2633 update_lft = 1;
2634 }
2635
2636 if (update_lft) {
2637 ifp->valid_lft = valid_lft;
2638 ifp->prefered_lft = prefered_lft;
2639 ifp->tstamp = now;
2640 flags = ifp->flags;
2641 ifp->flags &= ~IFA_F_DEPRECATED;
2642 spin_unlock_bh(&ifp->lock);
2643
2644 if (!(flags&IFA_F_TENTATIVE))
2645 ipv6_ifa_notify(0, ifp);
2646 } else
2647 spin_unlock_bh(&ifp->lock);
2648
2649 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2650 create, now);
2651
2652 in6_ifa_put(ifp);
2653 addrconf_verify();
2654 }
2655
2656 return 0;
2657 }
2658 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2659
2660 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2661 {
2662 struct prefix_info *pinfo;
2663 __u32 valid_lft;
2664 __u32 prefered_lft;
2665 int addr_type, err;
2666 u32 addr_flags = 0;
2667 struct inet6_dev *in6_dev;
2668 struct net *net = dev_net(dev);
2669
2670 pinfo = (struct prefix_info *) opt;
2671
2672 if (len < sizeof(struct prefix_info)) {
2673 netdev_dbg(dev, "addrconf: prefix option too short\n");
2674 return;
2675 }
2676
2677 /*
2678 * Validation checks ([ADDRCONF], page 19)
2679 */
2680
2681 addr_type = ipv6_addr_type(&pinfo->prefix);
2682
2683 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2684 return;
2685
2686 valid_lft = ntohl(pinfo->valid);
2687 prefered_lft = ntohl(pinfo->prefered);
2688
2689 if (prefered_lft > valid_lft) {
2690 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2691 return;
2692 }
2693
2694 in6_dev = in6_dev_get(dev);
2695
2696 if (!in6_dev) {
2697 net_dbg_ratelimited("addrconf: device %s not configured\n",
2698 dev->name);
2699 return;
2700 }
2701
2702 /*
2703 * Two things going on here:
2704 * 1) Add routes for on-link prefixes
2705 * 2) Configure prefixes with the auto flag set
2706 */
2707
2708 if (pinfo->onlink) {
2709 struct fib6_info *rt;
2710 unsigned long rt_expires;
2711
2712 /* Avoid arithmetic overflow. Really, we could
2713 * save rt_expires in seconds, likely valid_lft,
2714 * but it would require division in fib gc, that it
2715 * not good.
2716 */
2717 if (HZ > USER_HZ)
2718 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2719 else
2720 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2721
2722 if (addrconf_finite_timeout(rt_expires))
2723 rt_expires *= HZ;
2724
2725 rt = addrconf_get_prefix_route(&pinfo->prefix,
2726 pinfo->prefix_len,
2727 dev,
2728 RTF_ADDRCONF | RTF_PREFIX_RT,
2729 RTF_DEFAULT, true);
2730
2731 if (rt) {
2732 /* Autoconf prefix route */
2733 if (valid_lft == 0) {
2734 ip6_del_rt(net, rt);
2735 rt = NULL;
2736 } else if (addrconf_finite_timeout(rt_expires)) {
2737 /* not infinity */
2738 fib6_set_expires(rt, jiffies + rt_expires);
2739 } else {
2740 fib6_clean_expires(rt);
2741 }
2742 } else if (valid_lft) {
2743 clock_t expires = 0;
2744 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2745 if (addrconf_finite_timeout(rt_expires)) {
2746 /* not infinity */
2747 flags |= RTF_EXPIRES;
2748 expires = jiffies_to_clock_t(rt_expires);
2749 }
2750 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2751 0, dev, expires, flags,
2752 GFP_ATOMIC);
2753 }
2754 fib6_info_release(rt);
2755 }
2756
2757 /* Try to figure out our local address for this prefix */
2758
2759 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2760 struct in6_addr addr;
2761 bool tokenized = false, dev_addr_generated = false;
2762
2763 if (pinfo->prefix_len == 64) {
2764 memcpy(&addr, &pinfo->prefix, 8);
2765
2766 if (!ipv6_addr_any(&in6_dev->token)) {
2767 read_lock_bh(&in6_dev->lock);
2768 memcpy(addr.s6_addr + 8,
2769 in6_dev->token.s6_addr + 8, 8);
2770 read_unlock_bh(&in6_dev->lock);
2771 tokenized = true;
2772 } else if (is_addr_mode_generate_stable(in6_dev) &&
2773 !ipv6_generate_stable_address(&addr, 0,
2774 in6_dev)) {
2775 addr_flags |= IFA_F_STABLE_PRIVACY;
2776 goto ok;
2777 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2778 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2779 goto put;
2780 } else {
2781 dev_addr_generated = true;
2782 }
2783 goto ok;
2784 }
2785 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2786 pinfo->prefix_len);
2787 goto put;
2788
2789 ok:
2790 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2791 &addr, addr_type,
2792 addr_flags, sllao,
2793 tokenized, valid_lft,
2794 prefered_lft);
2795 if (err)
2796 goto put;
2797
2798 /* Ignore error case here because previous prefix add addr was
2799 * successful which will be notified.
2800 */
2801 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2802 addr_type, addr_flags, sllao,
2803 tokenized, valid_lft,
2804 prefered_lft,
2805 dev_addr_generated);
2806 }
2807 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2808 put:
2809 in6_dev_put(in6_dev);
2810 }
2811
2812 /*
2813 * Set destination address.
2814 * Special case for SIT interfaces where we create a new "virtual"
2815 * device.
2816 */
2817 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2818 {
2819 struct in6_ifreq ireq;
2820 struct net_device *dev;
2821 int err = -EINVAL;
2822
2823 rtnl_lock();
2824
2825 err = -EFAULT;
2826 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2827 goto err_exit;
2828
2829 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2830
2831 err = -ENODEV;
2832 if (!dev)
2833 goto err_exit;
2834
2835 #if IS_ENABLED(CONFIG_IPV6_SIT)
2836 if (dev->type == ARPHRD_SIT) {
2837 const struct net_device_ops *ops = dev->netdev_ops;
2838 struct ifreq ifr;
2839 struct ip_tunnel_parm p;
2840
2841 err = -EADDRNOTAVAIL;
2842 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2843 goto err_exit;
2844
2845 memset(&p, 0, sizeof(p));
2846 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2847 p.iph.saddr = 0;
2848 p.iph.version = 4;
2849 p.iph.ihl = 5;
2850 p.iph.protocol = IPPROTO_IPV6;
2851 p.iph.ttl = 64;
2852 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2853
2854 if (ops->ndo_do_ioctl) {
2855 mm_segment_t oldfs = get_fs();
2856
2857 set_fs(KERNEL_DS);
2858 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2859 set_fs(oldfs);
2860 } else
2861 err = -EOPNOTSUPP;
2862
2863 if (err == 0) {
2864 err = -ENOBUFS;
2865 dev = __dev_get_by_name(net, p.name);
2866 if (!dev)
2867 goto err_exit;
2868 err = dev_open(dev, NULL);
2869 }
2870 }
2871 #endif
2872
2873 err_exit:
2874 rtnl_unlock();
2875 return err;
2876 }
2877
2878 static int ipv6_mc_config(struct sock *sk, bool join,
2879 const struct in6_addr *addr, int ifindex)
2880 {
2881 int ret;
2882
2883 ASSERT_RTNL();
2884
2885 lock_sock(sk);
2886 if (join)
2887 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2888 else
2889 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2890 release_sock(sk);
2891
2892 return ret;
2893 }
2894
2895 /*
2896 * Manual configuration of address on an interface
2897 */
2898 static int inet6_addr_add(struct net *net, int ifindex,
2899 struct ifa6_config *cfg,
2900 struct netlink_ext_ack *extack)
2901 {
2902 struct inet6_ifaddr *ifp;
2903 struct inet6_dev *idev;
2904 struct net_device *dev;
2905 unsigned long timeout;
2906 clock_t expires;
2907 u32 flags;
2908
2909 ASSERT_RTNL();
2910
2911 if (cfg->plen > 128)
2912 return -EINVAL;
2913
2914 /* check the lifetime */
2915 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
2916 return -EINVAL;
2917
2918 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64)
2919 return -EINVAL;
2920
2921 dev = __dev_get_by_index(net, ifindex);
2922 if (!dev)
2923 return -ENODEV;
2924
2925 idev = addrconf_add_dev(dev);
2926 if (IS_ERR(idev))
2927 return PTR_ERR(idev);
2928
2929 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2930 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2931 true, cfg->pfx, ifindex);
2932
2933 if (ret < 0)
2934 return ret;
2935 }
2936
2937 cfg->scope = ipv6_addr_scope(cfg->pfx);
2938
2939 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
2940 if (addrconf_finite_timeout(timeout)) {
2941 expires = jiffies_to_clock_t(timeout * HZ);
2942 cfg->valid_lft = timeout;
2943 flags = RTF_EXPIRES;
2944 } else {
2945 expires = 0;
2946 flags = 0;
2947 cfg->ifa_flags |= IFA_F_PERMANENT;
2948 }
2949
2950 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
2951 if (addrconf_finite_timeout(timeout)) {
2952 if (timeout == 0)
2953 cfg->ifa_flags |= IFA_F_DEPRECATED;
2954 cfg->preferred_lft = timeout;
2955 }
2956
2957 ifp = ipv6_add_addr(idev, cfg, true, extack);
2958 if (!IS_ERR(ifp)) {
2959 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
2960 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
2961 ifp->rt_priority, dev, expires,
2962 flags, GFP_KERNEL);
2963 }
2964
2965 /* Send a netlink notification if DAD is enabled and
2966 * optimistic flag is not set
2967 */
2968 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
2969 ipv6_ifa_notify(0, ifp);
2970 /*
2971 * Note that section 3.1 of RFC 4429 indicates
2972 * that the Optimistic flag should not be set for
2973 * manually configured addresses
2974 */
2975 addrconf_dad_start(ifp);
2976 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
2977 manage_tempaddrs(idev, ifp, cfg->valid_lft,
2978 cfg->preferred_lft, true, jiffies);
2979 in6_ifa_put(ifp);
2980 addrconf_verify_rtnl();
2981 return 0;
2982 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2983 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
2984 cfg->pfx, ifindex);
2985 }
2986
2987 return PTR_ERR(ifp);
2988 }
2989
2990 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2991 const struct in6_addr *pfx, unsigned int plen)
2992 {
2993 struct inet6_ifaddr *ifp;
2994 struct inet6_dev *idev;
2995 struct net_device *dev;
2996
2997 if (plen > 128)
2998 return -EINVAL;
2999
3000 dev = __dev_get_by_index(net, ifindex);
3001 if (!dev)
3002 return -ENODEV;
3003
3004 idev = __in6_dev_get(dev);
3005 if (!idev)
3006 return -ENXIO;
3007
3008 read_lock_bh(&idev->lock);
3009 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3010 if (ifp->prefix_len == plen &&
3011 ipv6_addr_equal(pfx, &ifp->addr)) {
3012 in6_ifa_hold(ifp);
3013 read_unlock_bh(&idev->lock);
3014
3015 if (!(ifp->flags & IFA_F_TEMPORARY) &&
3016 (ifa_flags & IFA_F_MANAGETEMPADDR))
3017 manage_tempaddrs(idev, ifp, 0, 0, false,
3018 jiffies);
3019 ipv6_del_addr(ifp);
3020 addrconf_verify_rtnl();
3021 if (ipv6_addr_is_multicast(pfx)) {
3022 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3023 false, pfx, dev->ifindex);
3024 }
3025 return 0;
3026 }
3027 }
3028 read_unlock_bh(&idev->lock);
3029 return -EADDRNOTAVAIL;
3030 }
3031
3032
3033 int addrconf_add_ifaddr(struct net *net, void __user *arg)
3034 {
3035 struct ifa6_config cfg = {
3036 .ifa_flags = IFA_F_PERMANENT,
3037 .preferred_lft = INFINITY_LIFE_TIME,
3038 .valid_lft = INFINITY_LIFE_TIME,
3039 };
3040 struct in6_ifreq ireq;
3041 int err;
3042
3043 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3044 return -EPERM;
3045
3046 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3047 return -EFAULT;
3048
3049 cfg.pfx = &ireq.ifr6_addr;
3050 cfg.plen = ireq.ifr6_prefixlen;
3051
3052 rtnl_lock();
3053 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
3054 rtnl_unlock();
3055 return err;
3056 }
3057
3058 int addrconf_del_ifaddr(struct net *net, void __user *arg)
3059 {
3060 struct in6_ifreq ireq;
3061 int err;
3062
3063 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3064 return -EPERM;
3065
3066 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3067 return -EFAULT;
3068
3069 rtnl_lock();
3070 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
3071 ireq.ifr6_prefixlen);
3072 rtnl_unlock();
3073 return err;
3074 }
3075
3076 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3077 int plen, int scope)
3078 {
3079 struct inet6_ifaddr *ifp;
3080 struct ifa6_config cfg = {
3081 .pfx = addr,
3082 .plen = plen,
3083 .ifa_flags = IFA_F_PERMANENT,
3084 .valid_lft = INFINITY_LIFE_TIME,
3085 .preferred_lft = INFINITY_LIFE_TIME,
3086 .scope = scope
3087 };
3088
3089 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3090 if (!IS_ERR(ifp)) {
3091 spin_lock_bh(&ifp->lock);
3092 ifp->flags &= ~IFA_F_TENTATIVE;
3093 spin_unlock_bh(&ifp->lock);
3094 rt_genid_bump_ipv6(dev_net(idev->dev));
3095 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3096 in6_ifa_put(ifp);
3097 }
3098 }
3099
3100 #if IS_ENABLED(CONFIG_IPV6_SIT)
3101 static void sit_add_v4_addrs(struct inet6_dev *idev)
3102 {
3103 struct in6_addr addr;
3104 struct net_device *dev;
3105 struct net *net = dev_net(idev->dev);
3106 int scope, plen;
3107 u32 pflags = 0;
3108
3109 ASSERT_RTNL();
3110
3111 memset(&addr, 0, sizeof(struct in6_addr));
3112 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
3113
3114 if (idev->dev->flags&IFF_POINTOPOINT) {
3115 addr.s6_addr32[0] = htonl(0xfe800000);
3116 scope = IFA_LINK;
3117 plen = 64;
3118 } else {
3119 scope = IPV6_ADDR_COMPATv4;
3120 plen = 96;
3121 pflags |= RTF_NONEXTHOP;
3122 }
3123
3124 if (addr.s6_addr32[3]) {
3125 add_addr(idev, &addr, plen, scope);
3126 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
3127 GFP_KERNEL);
3128 return;
3129 }
3130
3131 for_each_netdev(net, dev) {
3132 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3133 if (in_dev && (dev->flags & IFF_UP)) {
3134 struct in_ifaddr *ifa;
3135 int flag = scope;
3136
3137 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
3138 addr.s6_addr32[3] = ifa->ifa_local;
3139
3140 if (ifa->ifa_scope == RT_SCOPE_LINK)
3141 continue;
3142 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3143 if (idev->dev->flags&IFF_POINTOPOINT)
3144 continue;
3145 flag |= IFA_HOST;
3146 }
3147
3148 add_addr(idev, &addr, plen, flag);
3149 addrconf_prefix_route(&addr, plen, 0, idev->dev,
3150 0, pflags, GFP_KERNEL);
3151 }
3152 }
3153 }
3154 }
3155 #endif
3156
3157 static void init_loopback(struct net_device *dev)
3158 {
3159 struct inet6_dev *idev;
3160
3161 /* ::1 */
3162
3163 ASSERT_RTNL();
3164
3165 idev = ipv6_find_idev(dev);
3166 if (IS_ERR(idev)) {
3167 pr_debug("%s: add_dev failed\n", __func__);
3168 return;
3169 }
3170
3171 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
3172 }
3173
3174 void addrconf_add_linklocal(struct inet6_dev *idev,
3175 const struct in6_addr *addr, u32 flags)
3176 {
3177 struct ifa6_config cfg = {
3178 .pfx = addr,
3179 .plen = 64,
3180 .ifa_flags = flags | IFA_F_PERMANENT,
3181 .valid_lft = INFINITY_LIFE_TIME,
3182 .preferred_lft = INFINITY_LIFE_TIME,
3183 .scope = IFA_LINK
3184 };
3185 struct inet6_ifaddr *ifp;
3186
3187 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3188 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3189 idev->cnf.optimistic_dad) &&
3190 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3191 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
3192 #endif
3193
3194 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3195 if (!IS_ERR(ifp)) {
3196 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
3197 0, 0, GFP_ATOMIC);
3198 addrconf_dad_start(ifp);
3199 in6_ifa_put(ifp);
3200 }
3201 }
3202 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3203
3204 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3205 {
3206 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3207 return true;
3208
3209 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3210 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3211 return true;
3212
3213 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3214 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3215 return true;
3216
3217 return false;
3218 }
3219
3220 static int ipv6_generate_stable_address(struct in6_addr *address,
3221 u8 dad_count,
3222 const struct inet6_dev *idev)
3223 {
3224 static DEFINE_SPINLOCK(lock);
3225 static __u32 digest[SHA_DIGEST_WORDS];
3226 static __u32 workspace[SHA_WORKSPACE_WORDS];
3227
3228 static union {
3229 char __data[SHA_MESSAGE_BYTES];
3230 struct {
3231 struct in6_addr secret;
3232 __be32 prefix[2];
3233 unsigned char hwaddr[MAX_ADDR_LEN];
3234 u8 dad_count;
3235 } __packed;
3236 } data;
3237
3238 struct in6_addr secret;
3239 struct in6_addr temp;
3240 struct net *net = dev_net(idev->dev);
3241
3242 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3243
3244 if (idev->cnf.stable_secret.initialized)
3245 secret = idev->cnf.stable_secret.secret;
3246 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3247 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3248 else
3249 return -1;
3250
3251 retry:
3252 spin_lock_bh(&lock);
3253
3254 sha_init(digest);
3255 memset(&data, 0, sizeof(data));
3256 memset(workspace, 0, sizeof(workspace));
3257 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3258 data.prefix[0] = address->s6_addr32[0];
3259 data.prefix[1] = address->s6_addr32[1];
3260 data.secret = secret;
3261 data.dad_count = dad_count;
3262
3263 sha_transform(digest, data.__data, workspace);
3264
3265 temp = *address;
3266 temp.s6_addr32[2] = (__force __be32)digest[0];
3267 temp.s6_addr32[3] = (__force __be32)digest[1];
3268
3269 spin_unlock_bh(&lock);
3270
3271 if (ipv6_reserved_interfaceid(temp)) {
3272 dad_count++;
3273 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3274 return -1;
3275 goto retry;
3276 }
3277
3278 *address = temp;
3279 return 0;
3280 }
3281
3282 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3283 {
3284 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3285
3286 if (s->initialized)
3287 return;
3288 s = &idev->cnf.stable_secret;
3289 get_random_bytes(&s->secret, sizeof(s->secret));
3290 s->initialized = true;
3291 }
3292
3293 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3294 {
3295 struct in6_addr addr;
3296
3297 /* no link local addresses on L3 master devices */
3298 if (netif_is_l3_master(idev->dev))
3299 return;
3300
3301 /* no link local addresses on devices flagged as slaves */
3302 if (idev->dev->flags & IFF_SLAVE)
3303 return;
3304
3305 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3306
3307 switch (idev->cnf.addr_gen_mode) {
3308 case IN6_ADDR_GEN_MODE_RANDOM:
3309 ipv6_gen_mode_random_init(idev);
3310 fallthrough;
3311 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3312 if (!ipv6_generate_stable_address(&addr, 0, idev))
3313 addrconf_add_linklocal(idev, &addr,
3314 IFA_F_STABLE_PRIVACY);
3315 else if (prefix_route)
3316 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3317 0, 0, GFP_KERNEL);
3318 break;
3319 case IN6_ADDR_GEN_MODE_EUI64:
3320 /* addrconf_add_linklocal also adds a prefix_route and we
3321 * only need to care about prefix routes if ipv6_generate_eui64
3322 * couldn't generate one.
3323 */
3324 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3325 addrconf_add_linklocal(idev, &addr, 0);
3326 else if (prefix_route)
3327 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3328 0, 0, GFP_KERNEL);
3329 break;
3330 case IN6_ADDR_GEN_MODE_NONE:
3331 default:
3332 /* will not add any link local address */
3333 break;
3334 }
3335 }
3336
3337 static void addrconf_dev_config(struct net_device *dev)
3338 {
3339 struct inet6_dev *idev;
3340
3341 ASSERT_RTNL();
3342
3343 if ((dev->type != ARPHRD_ETHER) &&
3344 (dev->type != ARPHRD_FDDI) &&
3345 (dev->type != ARPHRD_ARCNET) &&
3346 (dev->type != ARPHRD_INFINIBAND) &&
3347 (dev->type != ARPHRD_IEEE1394) &&
3348 (dev->type != ARPHRD_TUNNEL6) &&
3349 (dev->type != ARPHRD_6LOWPAN) &&
3350 (dev->type != ARPHRD_IP6GRE) &&
3351 (dev->type != ARPHRD_IPGRE) &&
3352 (dev->type != ARPHRD_TUNNEL) &&
3353 (dev->type != ARPHRD_NONE) &&
3354 (dev->type != ARPHRD_RAWIP)) {
3355 /* Alas, we support only Ethernet autoconfiguration. */
3356 idev = __in6_dev_get(dev);
3357 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP &&
3358 dev->flags & IFF_MULTICAST)
3359 ipv6_mc_up(idev);
3360 return;
3361 }
3362
3363 idev = addrconf_add_dev(dev);
3364 if (IS_ERR(idev))
3365 return;
3366
3367 /* this device type has no EUI support */
3368 if (dev->type == ARPHRD_NONE &&
3369 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3370 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3371
3372 addrconf_addr_gen(idev, false);
3373 }
3374
3375 #if IS_ENABLED(CONFIG_IPV6_SIT)
3376 static void addrconf_sit_config(struct net_device *dev)
3377 {
3378 struct inet6_dev *idev;
3379
3380 ASSERT_RTNL();
3381
3382 /*
3383 * Configure the tunnel with one of our IPv4
3384 * addresses... we should configure all of
3385 * our v4 addrs in the tunnel
3386 */
3387
3388 idev = ipv6_find_idev(dev);
3389 if (IS_ERR(idev)) {
3390 pr_debug("%s: add_dev failed\n", __func__);
3391 return;
3392 }
3393
3394 if (dev->priv_flags & IFF_ISATAP) {
3395 addrconf_addr_gen(idev, false);
3396 return;
3397 }
3398
3399 sit_add_v4_addrs(idev);
3400
3401 if (dev->flags&IFF_POINTOPOINT)
3402 addrconf_add_mroute(dev);
3403 }
3404 #endif
3405
3406 #if IS_ENABLED(CONFIG_NET_IPGRE)
3407 static void addrconf_gre_config(struct net_device *dev)
3408 {
3409 struct inet6_dev *idev;
3410
3411 ASSERT_RTNL();
3412
3413 idev = ipv6_find_idev(dev);
3414 if (IS_ERR(idev)) {
3415 pr_debug("%s: add_dev failed\n", __func__);
3416 return;
3417 }
3418
3419 addrconf_addr_gen(idev, true);
3420 if (dev->flags & IFF_POINTOPOINT)
3421 addrconf_add_mroute(dev);
3422 }
3423 #endif
3424
3425 static int fixup_permanent_addr(struct net *net,
3426 struct inet6_dev *idev,
3427 struct inet6_ifaddr *ifp)
3428 {
3429 /* !fib6_node means the host route was removed from the
3430 * FIB, for example, if 'lo' device is taken down. In that
3431 * case regenerate the host route.
3432 */
3433 if (!ifp->rt || !ifp->rt->fib6_node) {
3434 struct fib6_info *f6i, *prev;
3435
3436 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3437 GFP_ATOMIC);
3438 if (IS_ERR(f6i))
3439 return PTR_ERR(f6i);
3440
3441 /* ifp->rt can be accessed outside of rtnl */
3442 spin_lock(&ifp->lock);
3443 prev = ifp->rt;
3444 ifp->rt = f6i;
3445 spin_unlock(&ifp->lock);
3446
3447 fib6_info_release(prev);
3448 }
3449
3450 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3451 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3452 ifp->rt_priority, idev->dev, 0, 0,
3453 GFP_ATOMIC);
3454 }
3455
3456 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3457 addrconf_dad_start(ifp);
3458
3459 return 0;
3460 }
3461
3462 static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
3463 {
3464 struct inet6_ifaddr *ifp, *tmp;
3465 struct inet6_dev *idev;
3466
3467 idev = __in6_dev_get(dev);
3468 if (!idev)
3469 return;
3470
3471 write_lock_bh(&idev->lock);
3472
3473 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3474 if ((ifp->flags & IFA_F_PERMANENT) &&
3475 fixup_permanent_addr(net, idev, ifp) < 0) {
3476 write_unlock_bh(&idev->lock);
3477 in6_ifa_hold(ifp);
3478 ipv6_del_addr(ifp);
3479 write_lock_bh(&idev->lock);
3480
3481 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3482 idev->dev->name, &ifp->addr);
3483 }
3484 }
3485
3486 write_unlock_bh(&idev->lock);
3487 }
3488
3489 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3490 void *ptr)
3491 {
3492 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3493 struct netdev_notifier_change_info *change_info;
3494 struct netdev_notifier_changeupper_info *info;
3495 struct inet6_dev *idev = __in6_dev_get(dev);
3496 struct net *net = dev_net(dev);
3497 int run_pending = 0;
3498 int err;
3499
3500 switch (event) {
3501 case NETDEV_REGISTER:
3502 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3503 idev = ipv6_add_dev(dev);
3504 if (IS_ERR(idev))
3505 return notifier_from_errno(PTR_ERR(idev));
3506 }
3507 break;
3508
3509 case NETDEV_CHANGEMTU:
3510 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3511 if (dev->mtu < IPV6_MIN_MTU) {
3512 addrconf_ifdown(dev, dev != net->loopback_dev);
3513 break;
3514 }
3515
3516 if (idev) {
3517 rt6_mtu_change(dev, dev->mtu);
3518 idev->cnf.mtu6 = dev->mtu;
3519 break;
3520 }
3521
3522 /* allocate new idev */
3523 idev = ipv6_add_dev(dev);
3524 if (IS_ERR(idev))
3525 break;
3526
3527 /* device is still not ready */
3528 if (!(idev->if_flags & IF_READY))
3529 break;
3530
3531 run_pending = 1;
3532 fallthrough;
3533 case NETDEV_UP:
3534 case NETDEV_CHANGE:
3535 if (dev->flags & IFF_SLAVE)
3536 break;
3537
3538 if (idev && idev->cnf.disable_ipv6)
3539 break;
3540
3541 if (event == NETDEV_UP) {
3542 /* restore routes for permanent addresses */
3543 addrconf_permanent_addr(net, dev);
3544
3545 if (!addrconf_link_ready(dev)) {
3546 /* device is not ready yet. */
3547 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3548 dev->name);
3549 break;
3550 }
3551
3552 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3553 idev = ipv6_add_dev(dev);
3554
3555 if (!IS_ERR_OR_NULL(idev)) {
3556 idev->if_flags |= IF_READY;
3557 run_pending = 1;
3558 }
3559 } else if (event == NETDEV_CHANGE) {
3560 if (!addrconf_link_ready(dev)) {
3561 /* device is still not ready. */
3562 rt6_sync_down_dev(dev, event);
3563 break;
3564 }
3565
3566 if (!IS_ERR_OR_NULL(idev)) {
3567 if (idev->if_flags & IF_READY) {
3568 /* device is already configured -
3569 * but resend MLD reports, we might
3570 * have roamed and need to update
3571 * multicast snooping switches
3572 */
3573 ipv6_mc_up(idev);
3574 change_info = ptr;
3575 if (change_info->flags_changed & IFF_NOARP)
3576 addrconf_dad_run(idev, true);
3577 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3578 break;
3579 }
3580 idev->if_flags |= IF_READY;
3581 }
3582
3583 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3584 dev->name);
3585
3586 run_pending = 1;
3587 }
3588
3589 switch (dev->type) {
3590 #if IS_ENABLED(CONFIG_IPV6_SIT)
3591 case ARPHRD_SIT:
3592 addrconf_sit_config(dev);
3593 break;
3594 #endif
3595 #if IS_ENABLED(CONFIG_NET_IPGRE)
3596 case ARPHRD_IPGRE:
3597 addrconf_gre_config(dev);
3598 break;
3599 #endif
3600 case ARPHRD_LOOPBACK:
3601 init_loopback(dev);
3602 break;
3603
3604 default:
3605 addrconf_dev_config(dev);
3606 break;
3607 }
3608
3609 if (!IS_ERR_OR_NULL(idev)) {
3610 if (run_pending)
3611 addrconf_dad_run(idev, false);
3612
3613 /* Device has an address by now */
3614 rt6_sync_up(dev, RTNH_F_DEAD);
3615
3616 /*
3617 * If the MTU changed during the interface down,
3618 * when the interface up, the changed MTU must be
3619 * reflected in the idev as well as routers.
3620 */
3621 if (idev->cnf.mtu6 != dev->mtu &&
3622 dev->mtu >= IPV6_MIN_MTU) {
3623 rt6_mtu_change(dev, dev->mtu);
3624 idev->cnf.mtu6 = dev->mtu;
3625 }
3626 idev->tstamp = jiffies;
3627 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3628
3629 /*
3630 * If the changed mtu during down is lower than
3631 * IPV6_MIN_MTU stop IPv6 on this interface.
3632 */
3633 if (dev->mtu < IPV6_MIN_MTU)
3634 addrconf_ifdown(dev, dev != net->loopback_dev);
3635 }
3636 break;
3637
3638 case NETDEV_DOWN:
3639 case NETDEV_UNREGISTER:
3640 /*
3641 * Remove all addresses from this interface.
3642 */
3643 addrconf_ifdown(dev, event != NETDEV_DOWN);
3644 break;
3645
3646 case NETDEV_CHANGENAME:
3647 if (idev) {
3648 snmp6_unregister_dev(idev);
3649 addrconf_sysctl_unregister(idev);
3650 err = addrconf_sysctl_register(idev);
3651 if (err)
3652 return notifier_from_errno(err);
3653 err = snmp6_register_dev(idev);
3654 if (err) {
3655 addrconf_sysctl_unregister(idev);
3656 return notifier_from_errno(err);
3657 }
3658 }
3659 break;
3660
3661 case NETDEV_PRE_TYPE_CHANGE:
3662 case NETDEV_POST_TYPE_CHANGE:
3663 if (idev)
3664 addrconf_type_change(dev, event);
3665 break;
3666
3667 case NETDEV_CHANGEUPPER:
3668 info = ptr;
3669
3670 /* flush all routes if dev is linked to or unlinked from
3671 * an L3 master device (e.g., VRF)
3672 */
3673 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3674 addrconf_ifdown(dev, 0);
3675 }
3676
3677 return NOTIFY_OK;
3678 }
3679
3680 /*
3681 * addrconf module should be notified of a device going up
3682 */
3683 static struct notifier_block ipv6_dev_notf = {
3684 .notifier_call = addrconf_notify,
3685 .priority = ADDRCONF_NOTIFY_PRIORITY,
3686 };
3687
3688 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3689 {
3690 struct inet6_dev *idev;
3691 ASSERT_RTNL();
3692
3693 idev = __in6_dev_get(dev);
3694
3695 if (event == NETDEV_POST_TYPE_CHANGE)
3696 ipv6_mc_remap(idev);
3697 else if (event == NETDEV_PRE_TYPE_CHANGE)
3698 ipv6_mc_unmap(idev);
3699 }
3700
3701 static bool addr_is_local(const struct in6_addr *addr)
3702 {
3703 return ipv6_addr_type(addr) &
3704 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3705 }
3706
3707 static int addrconf_ifdown(struct net_device *dev, int how)
3708 {
3709 unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN;
3710 struct net *net = dev_net(dev);
3711 struct inet6_dev *idev;
3712 struct inet6_ifaddr *ifa, *tmp;
3713 bool keep_addr = false;
3714 int state, i;
3715
3716 ASSERT_RTNL();
3717
3718 rt6_disable_ip(dev, event);
3719
3720 idev = __in6_dev_get(dev);
3721 if (!idev)
3722 return -ENODEV;
3723
3724 /*
3725 * Step 1: remove reference to ipv6 device from parent device.
3726 * Do not dev_put!
3727 */
3728 if (how) {
3729 idev->dead = 1;
3730
3731 /* protected by rtnl_lock */
3732 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3733
3734 /* Step 1.5: remove snmp6 entry */
3735 snmp6_unregister_dev(idev);
3736
3737 }
3738
3739 /* combine the user config with event to determine if permanent
3740 * addresses are to be removed from address hash table
3741 */
3742 if (!how && !idev->cnf.disable_ipv6) {
3743 /* aggregate the system setting and interface setting */
3744 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3745
3746 if (!_keep_addr)
3747 _keep_addr = idev->cnf.keep_addr_on_down;
3748
3749 keep_addr = (_keep_addr > 0);
3750 }
3751
3752 /* Step 2: clear hash table */
3753 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3754 struct hlist_head *h = &inet6_addr_lst[i];
3755
3756 spin_lock_bh(&addrconf_hash_lock);
3757 restart:
3758 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3759 if (ifa->idev == idev) {
3760 addrconf_del_dad_work(ifa);
3761 /* combined flag + permanent flag decide if
3762 * address is retained on a down event
3763 */
3764 if (!keep_addr ||
3765 !(ifa->flags & IFA_F_PERMANENT) ||
3766 addr_is_local(&ifa->addr)) {
3767 hlist_del_init_rcu(&ifa->addr_lst);
3768 goto restart;
3769 }
3770 }
3771 }
3772 spin_unlock_bh(&addrconf_hash_lock);
3773 }
3774
3775 write_lock_bh(&idev->lock);
3776
3777 addrconf_del_rs_timer(idev);
3778
3779 /* Step 2: clear flags for stateless addrconf */
3780 if (!how)
3781 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3782
3783 /* Step 3: clear tempaddr list */
3784 while (!list_empty(&idev->tempaddr_list)) {
3785 ifa = list_first_entry(&idev->tempaddr_list,
3786 struct inet6_ifaddr, tmp_list);
3787 list_del(&ifa->tmp_list);
3788 write_unlock_bh(&idev->lock);
3789 spin_lock_bh(&ifa->lock);
3790
3791 if (ifa->ifpub) {
3792 in6_ifa_put(ifa->ifpub);
3793 ifa->ifpub = NULL;
3794 }
3795 spin_unlock_bh(&ifa->lock);
3796 in6_ifa_put(ifa);
3797 write_lock_bh(&idev->lock);
3798 }
3799
3800 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3801 struct fib6_info *rt = NULL;
3802 bool keep;
3803
3804 addrconf_del_dad_work(ifa);
3805
3806 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3807 !addr_is_local(&ifa->addr);
3808
3809 write_unlock_bh(&idev->lock);
3810 spin_lock_bh(&ifa->lock);
3811
3812 if (keep) {
3813 /* set state to skip the notifier below */
3814 state = INET6_IFADDR_STATE_DEAD;
3815 ifa->state = INET6_IFADDR_STATE_PREDAD;
3816 if (!(ifa->flags & IFA_F_NODAD))
3817 ifa->flags |= IFA_F_TENTATIVE;
3818
3819 rt = ifa->rt;
3820 ifa->rt = NULL;
3821 } else {
3822 state = ifa->state;
3823 ifa->state = INET6_IFADDR_STATE_DEAD;
3824 }
3825
3826 spin_unlock_bh(&ifa->lock);
3827
3828 if (rt)
3829 ip6_del_rt(net, rt);
3830
3831 if (state != INET6_IFADDR_STATE_DEAD) {
3832 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3833 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3834 } else {
3835 if (idev->cnf.forwarding)
3836 addrconf_leave_anycast(ifa);
3837 addrconf_leave_solict(ifa->idev, &ifa->addr);
3838 }
3839
3840 write_lock_bh(&idev->lock);
3841 if (!keep) {
3842 list_del_rcu(&ifa->if_list);
3843 in6_ifa_put(ifa);
3844 }
3845 }
3846
3847 write_unlock_bh(&idev->lock);
3848
3849 /* Step 5: Discard anycast and multicast list */
3850 if (how) {
3851 ipv6_ac_destroy_dev(idev);
3852 ipv6_mc_destroy_dev(idev);
3853 } else {
3854 ipv6_mc_down(idev);
3855 }
3856
3857 idev->tstamp = jiffies;
3858
3859 /* Last: Shot the device (if unregistered) */
3860 if (how) {
3861 addrconf_sysctl_unregister(idev);
3862 neigh_parms_release(&nd_tbl, idev->nd_parms);
3863 neigh_ifdown(&nd_tbl, dev);
3864 in6_dev_put(idev);
3865 }
3866 return 0;
3867 }
3868
3869 static void addrconf_rs_timer(struct timer_list *t)
3870 {
3871 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
3872 struct net_device *dev = idev->dev;
3873 struct in6_addr lladdr;
3874
3875 write_lock(&idev->lock);
3876 if (idev->dead || !(idev->if_flags & IF_READY))
3877 goto out;
3878
3879 if (!ipv6_accept_ra(idev))
3880 goto out;
3881
3882 /* Announcement received after solicitation was sent */
3883 if (idev->if_flags & IF_RA_RCVD)
3884 goto out;
3885
3886 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3887 write_unlock(&idev->lock);
3888 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3889 ndisc_send_rs(dev, &lladdr,
3890 &in6addr_linklocal_allrouters);
3891 else
3892 goto put;
3893
3894 write_lock(&idev->lock);
3895 idev->rs_interval = rfc3315_s14_backoff_update(
3896 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3897 /* The wait after the last probe can be shorter */
3898 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3899 idev->cnf.rtr_solicits) ?
3900 idev->cnf.rtr_solicit_delay :
3901 idev->rs_interval);
3902 } else {
3903 /*
3904 * Note: we do not support deprecated "all on-link"
3905 * assumption any longer.
3906 */
3907 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3908 }
3909
3910 out:
3911 write_unlock(&idev->lock);
3912 put:
3913 in6_dev_put(idev);
3914 }
3915
3916 /*
3917 * Duplicate Address Detection
3918 */
3919 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3920 {
3921 unsigned long rand_num;
3922 struct inet6_dev *idev = ifp->idev;
3923 u64 nonce;
3924
3925 if (ifp->flags & IFA_F_OPTIMISTIC)
3926 rand_num = 0;
3927 else
3928 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3929
3930 nonce = 0;
3931 if (idev->cnf.enhanced_dad ||
3932 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3933 do
3934 get_random_bytes(&nonce, 6);
3935 while (nonce == 0);
3936 }
3937 ifp->dad_nonce = nonce;
3938 ifp->dad_probes = idev->cnf.dad_transmits;
3939 addrconf_mod_dad_work(ifp, rand_num);
3940 }
3941
3942 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3943 {
3944 struct inet6_dev *idev = ifp->idev;
3945 struct net_device *dev = idev->dev;
3946 bool bump_id, notify = false;
3947 struct net *net;
3948
3949 addrconf_join_solict(dev, &ifp->addr);
3950
3951 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3952
3953 read_lock_bh(&idev->lock);
3954 spin_lock(&ifp->lock);
3955 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3956 goto out;
3957
3958 net = dev_net(dev);
3959 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3960 (net->ipv6.devconf_all->accept_dad < 1 &&
3961 idev->cnf.accept_dad < 1) ||
3962 !(ifp->flags&IFA_F_TENTATIVE) ||
3963 ifp->flags & IFA_F_NODAD) {
3964 bool send_na = false;
3965
3966 if (ifp->flags & IFA_F_TENTATIVE &&
3967 !(ifp->flags & IFA_F_OPTIMISTIC))
3968 send_na = true;
3969 bump_id = ifp->flags & IFA_F_TENTATIVE;
3970 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3971 spin_unlock(&ifp->lock);
3972 read_unlock_bh(&idev->lock);
3973
3974 addrconf_dad_completed(ifp, bump_id, send_na);
3975 return;
3976 }
3977
3978 if (!(idev->if_flags & IF_READY)) {
3979 spin_unlock(&ifp->lock);
3980 read_unlock_bh(&idev->lock);
3981 /*
3982 * If the device is not ready:
3983 * - keep it tentative if it is a permanent address.
3984 * - otherwise, kill it.
3985 */
3986 in6_ifa_hold(ifp);
3987 addrconf_dad_stop(ifp, 0);
3988 return;
3989 }
3990
3991 /*
3992 * Optimistic nodes can start receiving
3993 * Frames right away
3994 */
3995 if (ifp->flags & IFA_F_OPTIMISTIC) {
3996 ip6_ins_rt(net, ifp->rt);
3997 if (ipv6_use_optimistic_addr(net, idev)) {
3998 /* Because optimistic nodes can use this address,
3999 * notify listeners. If DAD fails, RTM_DELADDR is sent.
4000 */
4001 notify = true;
4002 }
4003 }
4004
4005 addrconf_dad_kick(ifp);
4006 out:
4007 spin_unlock(&ifp->lock);
4008 read_unlock_bh(&idev->lock);
4009 if (notify)
4010 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4011 }
4012
4013 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
4014 {
4015 bool begin_dad = false;
4016
4017 spin_lock_bh(&ifp->lock);
4018 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
4019 ifp->state = INET6_IFADDR_STATE_PREDAD;
4020 begin_dad = true;
4021 }
4022 spin_unlock_bh(&ifp->lock);
4023
4024 if (begin_dad)
4025 addrconf_mod_dad_work(ifp, 0);
4026 }
4027
4028 static void addrconf_dad_work(struct work_struct *w)
4029 {
4030 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
4031 struct inet6_ifaddr,
4032 dad_work);
4033 struct inet6_dev *idev = ifp->idev;
4034 bool bump_id, disable_ipv6 = false;
4035 struct in6_addr mcaddr;
4036
4037 enum {
4038 DAD_PROCESS,
4039 DAD_BEGIN,
4040 DAD_ABORT,
4041 } action = DAD_PROCESS;
4042
4043 rtnl_lock();
4044
4045 spin_lock_bh(&ifp->lock);
4046 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
4047 action = DAD_BEGIN;
4048 ifp->state = INET6_IFADDR_STATE_DAD;
4049 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4050 action = DAD_ABORT;
4051 ifp->state = INET6_IFADDR_STATE_POSTDAD;
4052
4053 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
4054 idev->cnf.accept_dad > 1) &&
4055 !idev->cnf.disable_ipv6 &&
4056 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4057 struct in6_addr addr;
4058
4059 addr.s6_addr32[0] = htonl(0xfe800000);
4060 addr.s6_addr32[1] = 0;
4061
4062 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4063 ipv6_addr_equal(&ifp->addr, &addr)) {
4064 /* DAD failed for link-local based on MAC */
4065 idev->cnf.disable_ipv6 = 1;
4066
4067 pr_info("%s: IPv6 being disabled!\n",
4068 ifp->idev->dev->name);
4069 disable_ipv6 = true;
4070 }
4071 }
4072 }
4073 spin_unlock_bh(&ifp->lock);
4074
4075 if (action == DAD_BEGIN) {
4076 addrconf_dad_begin(ifp);
4077 goto out;
4078 } else if (action == DAD_ABORT) {
4079 in6_ifa_hold(ifp);
4080 addrconf_dad_stop(ifp, 1);
4081 if (disable_ipv6)
4082 addrconf_ifdown(idev->dev, 0);
4083 goto out;
4084 }
4085
4086 if (!ifp->dad_probes && addrconf_dad_end(ifp))
4087 goto out;
4088
4089 write_lock_bh(&idev->lock);
4090 if (idev->dead || !(idev->if_flags & IF_READY)) {
4091 write_unlock_bh(&idev->lock);
4092 goto out;
4093 }
4094
4095 spin_lock(&ifp->lock);
4096 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4097 spin_unlock(&ifp->lock);
4098 write_unlock_bh(&idev->lock);
4099 goto out;
4100 }
4101
4102 if (ifp->dad_probes == 0) {
4103 bool send_na = false;
4104
4105 /*
4106 * DAD was successful
4107 */
4108
4109 if (ifp->flags & IFA_F_TENTATIVE &&
4110 !(ifp->flags & IFA_F_OPTIMISTIC))
4111 send_na = true;
4112 bump_id = ifp->flags & IFA_F_TENTATIVE;
4113 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4114 spin_unlock(&ifp->lock);
4115 write_unlock_bh(&idev->lock);
4116
4117 addrconf_dad_completed(ifp, bump_id, send_na);
4118
4119 goto out;
4120 }
4121
4122 ifp->dad_probes--;
4123 addrconf_mod_dad_work(ifp,
4124 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME),
4125 HZ/100));
4126 spin_unlock(&ifp->lock);
4127 write_unlock_bh(&idev->lock);
4128
4129 /* send a neighbour solicitation for our addr */
4130 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4131 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4132 ifp->dad_nonce);
4133 out:
4134 in6_ifa_put(ifp);
4135 rtnl_unlock();
4136 }
4137
4138 /* ifp->idev must be at least read locked */
4139 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4140 {
4141 struct inet6_ifaddr *ifpiter;
4142 struct inet6_dev *idev = ifp->idev;
4143
4144 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4145 if (ifpiter->scope > IFA_LINK)
4146 break;
4147 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4148 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4149 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4150 IFA_F_PERMANENT)
4151 return false;
4152 }
4153 return true;
4154 }
4155
4156 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4157 bool send_na)
4158 {
4159 struct net_device *dev = ifp->idev->dev;
4160 struct in6_addr lladdr;
4161 bool send_rs, send_mld;
4162
4163 addrconf_del_dad_work(ifp);
4164
4165 /*
4166 * Configure the address for reception. Now it is valid.
4167 */
4168
4169 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4170
4171 /* If added prefix is link local and we are prepared to process
4172 router advertisements, start sending router solicitations.
4173 */
4174
4175 read_lock_bh(&ifp->idev->lock);
4176 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4177 send_rs = send_mld &&
4178 ipv6_accept_ra(ifp->idev) &&
4179 ifp->idev->cnf.rtr_solicits != 0 &&
4180 (dev->flags&IFF_LOOPBACK) == 0;
4181 read_unlock_bh(&ifp->idev->lock);
4182
4183 /* While dad is in progress mld report's source address is in6_addrany.
4184 * Resend with proper ll now.
4185 */
4186 if (send_mld)
4187 ipv6_mc_dad_complete(ifp->idev);
4188
4189 /* send unsolicited NA if enabled */
4190 if (send_na &&
4191 (ifp->idev->cnf.ndisc_notify ||
4192 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4193 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4194 /*router=*/ !!ifp->idev->cnf.forwarding,
4195 /*solicited=*/ false, /*override=*/ true,
4196 /*inc_opt=*/ true);
4197 }
4198
4199 if (send_rs) {
4200 /*
4201 * If a host as already performed a random delay
4202 * [...] as part of DAD [...] there is no need
4203 * to delay again before sending the first RS
4204 */
4205 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4206 return;
4207 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4208
4209 write_lock_bh(&ifp->idev->lock);
4210 spin_lock(&ifp->lock);
4211 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4212 ifp->idev->cnf.rtr_solicit_interval);
4213 ifp->idev->rs_probes = 1;
4214 ifp->idev->if_flags |= IF_RS_SENT;
4215 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4216 spin_unlock(&ifp->lock);
4217 write_unlock_bh(&ifp->idev->lock);
4218 }
4219
4220 if (bump_id)
4221 rt_genid_bump_ipv6(dev_net(dev));
4222
4223 /* Make sure that a new temporary address will be created
4224 * before this temporary address becomes deprecated.
4225 */
4226 if (ifp->flags & IFA_F_TEMPORARY)
4227 addrconf_verify_rtnl();
4228 }
4229
4230 static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
4231 {
4232 struct inet6_ifaddr *ifp;
4233
4234 read_lock_bh(&idev->lock);
4235 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4236 spin_lock(&ifp->lock);
4237 if ((ifp->flags & IFA_F_TENTATIVE &&
4238 ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4239 if (restart)
4240 ifp->state = INET6_IFADDR_STATE_PREDAD;
4241 addrconf_dad_kick(ifp);
4242 }
4243 spin_unlock(&ifp->lock);
4244 }
4245 read_unlock_bh(&idev->lock);
4246 }
4247
4248 #ifdef CONFIG_PROC_FS
4249 struct if6_iter_state {
4250 struct seq_net_private p;
4251 int bucket;
4252 int offset;
4253 };
4254
4255 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4256 {
4257 struct if6_iter_state *state = seq->private;
4258 struct net *net = seq_file_net(seq);
4259 struct inet6_ifaddr *ifa = NULL;
4260 int p = 0;
4261
4262 /* initial bucket if pos is 0 */
4263 if (pos == 0) {
4264 state->bucket = 0;
4265 state->offset = 0;
4266 }
4267
4268 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4269 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket],
4270 addr_lst) {
4271 if (!net_eq(dev_net(ifa->idev->dev), net))
4272 continue;
4273 /* sync with offset */
4274 if (p < state->offset) {
4275 p++;
4276 continue;
4277 }
4278 return ifa;
4279 }
4280
4281 /* prepare for next bucket */
4282 state->offset = 0;
4283 p = 0;
4284 }
4285 return NULL;
4286 }
4287
4288 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4289 struct inet6_ifaddr *ifa)
4290 {
4291 struct if6_iter_state *state = seq->private;
4292 struct net *net = seq_file_net(seq);
4293
4294 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4295 if (!net_eq(dev_net(ifa->idev->dev), net))
4296 continue;
4297 state->offset++;
4298 return ifa;
4299 }
4300
4301 state->offset = 0;
4302 while (++state->bucket < IN6_ADDR_HSIZE) {
4303 hlist_for_each_entry_rcu(ifa,
4304 &inet6_addr_lst[state->bucket], addr_lst) {
4305 if (!net_eq(dev_net(ifa->idev->dev), net))
4306 continue;
4307 return ifa;
4308 }
4309 }
4310
4311 return NULL;
4312 }
4313
4314 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4315 __acquires(rcu)
4316 {
4317 rcu_read_lock();
4318 return if6_get_first(seq, *pos);
4319 }
4320
4321 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4322 {
4323 struct inet6_ifaddr *ifa;
4324
4325 ifa = if6_get_next(seq, v);
4326 ++*pos;
4327 return ifa;
4328 }
4329
4330 static void if6_seq_stop(struct seq_file *seq, void *v)
4331 __releases(rcu)
4332 {
4333 rcu_read_unlock();
4334 }
4335
4336 static int if6_seq_show(struct seq_file *seq, void *v)
4337 {
4338 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4339 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4340 &ifp->addr,
4341 ifp->idev->dev->ifindex,
4342 ifp->prefix_len,
4343 ifp->scope,
4344 (u8) ifp->flags,
4345 ifp->idev->dev->name);
4346 return 0;
4347 }
4348
4349 static const struct seq_operations if6_seq_ops = {
4350 .start = if6_seq_start,
4351 .next = if6_seq_next,
4352 .show = if6_seq_show,
4353 .stop = if6_seq_stop,
4354 };
4355
4356 static int __net_init if6_proc_net_init(struct net *net)
4357 {
4358 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4359 sizeof(struct if6_iter_state)))
4360 return -ENOMEM;
4361 return 0;
4362 }
4363
4364 static void __net_exit if6_proc_net_exit(struct net *net)
4365 {
4366 remove_proc_entry("if_inet6", net->proc_net);
4367 }
4368
4369 static struct pernet_operations if6_proc_net_ops = {
4370 .init = if6_proc_net_init,
4371 .exit = if6_proc_net_exit,
4372 };
4373
4374 int __init if6_proc_init(void)
4375 {
4376 return register_pernet_subsys(&if6_proc_net_ops);
4377 }
4378
4379 void if6_proc_exit(void)
4380 {
4381 unregister_pernet_subsys(&if6_proc_net_ops);
4382 }
4383 #endif /* CONFIG_PROC_FS */
4384
4385 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4386 /* Check if address is a home address configured on any interface. */
4387 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4388 {
4389 unsigned int hash = inet6_addr_hash(net, addr);
4390 struct inet6_ifaddr *ifp = NULL;
4391 int ret = 0;
4392
4393 rcu_read_lock();
4394 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4395 if (!net_eq(dev_net(ifp->idev->dev), net))
4396 continue;
4397 if (ipv6_addr_equal(&ifp->addr, addr) &&
4398 (ifp->flags & IFA_F_HOMEADDRESS)) {
4399 ret = 1;
4400 break;
4401 }
4402 }
4403 rcu_read_unlock();
4404 return ret;
4405 }
4406 #endif
4407
4408 /* RFC6554 has some algorithm to avoid loops in segment routing by
4409 * checking if the segments contains any of a local interface address.
4410 *
4411 * Quote:
4412 *
4413 * To detect loops in the SRH, a router MUST determine if the SRH
4414 * includes multiple addresses assigned to any interface on that router.
4415 * If such addresses appear more than once and are separated by at least
4416 * one address not assigned to that router.
4417 */
4418 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
4419 unsigned char nsegs)
4420 {
4421 const struct in6_addr *addr;
4422 int i, ret = 0, found = 0;
4423 struct inet6_ifaddr *ifp;
4424 bool separated = false;
4425 unsigned int hash;
4426 bool hash_found;
4427
4428 rcu_read_lock();
4429 for (i = 0; i < nsegs; i++) {
4430 addr = &segs[i];
4431 hash = inet6_addr_hash(net, addr);
4432
4433 hash_found = false;
4434 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4435 if (!net_eq(dev_net(ifp->idev->dev), net))
4436 continue;
4437
4438 if (ipv6_addr_equal(&ifp->addr, addr)) {
4439 hash_found = true;
4440 break;
4441 }
4442 }
4443
4444 if (hash_found) {
4445 if (found > 1 && separated) {
4446 ret = 1;
4447 break;
4448 }
4449
4450 separated = false;
4451 found++;
4452 } else {
4453 separated = true;
4454 }
4455 }
4456 rcu_read_unlock();
4457
4458 return ret;
4459 }
4460
4461 /*
4462 * Periodic address status verification
4463 */
4464
4465 static void addrconf_verify_rtnl(void)
4466 {
4467 unsigned long now, next, next_sec, next_sched;
4468 struct inet6_ifaddr *ifp;
4469 int i;
4470
4471 ASSERT_RTNL();
4472
4473 rcu_read_lock_bh();
4474 now = jiffies;
4475 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4476
4477 cancel_delayed_work(&addr_chk_work);
4478
4479 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4480 restart:
4481 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4482 unsigned long age;
4483
4484 /* When setting preferred_lft to a value not zero or
4485 * infinity, while valid_lft is infinity
4486 * IFA_F_PERMANENT has a non-infinity life time.
4487 */
4488 if ((ifp->flags & IFA_F_PERMANENT) &&
4489 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4490 continue;
4491
4492 spin_lock(&ifp->lock);
4493 /* We try to batch several events at once. */
4494 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4495
4496 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4497 age >= ifp->valid_lft) {
4498 spin_unlock(&ifp->lock);
4499 in6_ifa_hold(ifp);
4500 ipv6_del_addr(ifp);
4501 goto restart;
4502 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4503 spin_unlock(&ifp->lock);
4504 continue;
4505 } else if (age >= ifp->prefered_lft) {
4506 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4507 int deprecate = 0;
4508
4509 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4510 deprecate = 1;
4511 ifp->flags |= IFA_F_DEPRECATED;
4512 }
4513
4514 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4515 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4516 next = ifp->tstamp + ifp->valid_lft * HZ;
4517
4518 spin_unlock(&ifp->lock);
4519
4520 if (deprecate) {
4521 in6_ifa_hold(ifp);
4522
4523 ipv6_ifa_notify(0, ifp);
4524 in6_ifa_put(ifp);
4525 goto restart;
4526 }
4527 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4528 !(ifp->flags&IFA_F_TENTATIVE)) {
4529 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4530 ifp->idev->cnf.dad_transmits *
4531 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
4532
4533 if (age >= ifp->prefered_lft - regen_advance) {
4534 struct inet6_ifaddr *ifpub = ifp->ifpub;
4535 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4536 next = ifp->tstamp + ifp->prefered_lft * HZ;
4537 if (!ifp->regen_count && ifpub) {
4538 ifp->regen_count++;
4539 in6_ifa_hold(ifp);
4540 in6_ifa_hold(ifpub);
4541 spin_unlock(&ifp->lock);
4542
4543 spin_lock(&ifpub->lock);
4544 ifpub->regen_count = 0;
4545 spin_unlock(&ifpub->lock);
4546 rcu_read_unlock_bh();
4547 ipv6_create_tempaddr(ifpub, ifp, true);
4548 in6_ifa_put(ifpub);
4549 in6_ifa_put(ifp);
4550 rcu_read_lock_bh();
4551 goto restart;
4552 }
4553 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4554 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4555 spin_unlock(&ifp->lock);
4556 } else {
4557 /* ifp->prefered_lft <= ifp->valid_lft */
4558 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4559 next = ifp->tstamp + ifp->prefered_lft * HZ;
4560 spin_unlock(&ifp->lock);
4561 }
4562 }
4563 }
4564
4565 next_sec = round_jiffies_up(next);
4566 next_sched = next;
4567
4568 /* If rounded timeout is accurate enough, accept it. */
4569 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4570 next_sched = next_sec;
4571
4572 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4573 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4574 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4575
4576 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4577 now, next, next_sec, next_sched);
4578 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4579 rcu_read_unlock_bh();
4580 }
4581
4582 static void addrconf_verify_work(struct work_struct *w)
4583 {
4584 rtnl_lock();
4585 addrconf_verify_rtnl();
4586 rtnl_unlock();
4587 }
4588
4589 static void addrconf_verify(void)
4590 {
4591 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4592 }
4593
4594 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4595 struct in6_addr **peer_pfx)
4596 {
4597 struct in6_addr *pfx = NULL;
4598
4599 *peer_pfx = NULL;
4600
4601 if (addr)
4602 pfx = nla_data(addr);
4603
4604 if (local) {
4605 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4606 *peer_pfx = pfx;
4607 pfx = nla_data(local);
4608 }
4609
4610 return pfx;
4611 }
4612
4613 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4614 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4615 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4616 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4617 [IFA_FLAGS] = { .len = sizeof(u32) },
4618 [IFA_RT_PRIORITY] = { .len = sizeof(u32) },
4619 [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
4620 };
4621
4622 static int
4623 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4624 struct netlink_ext_ack *extack)
4625 {
4626 struct net *net = sock_net(skb->sk);
4627 struct ifaddrmsg *ifm;
4628 struct nlattr *tb[IFA_MAX+1];
4629 struct in6_addr *pfx, *peer_pfx;
4630 u32 ifa_flags;
4631 int err;
4632
4633 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4634 ifa_ipv6_policy, extack);
4635 if (err < 0)
4636 return err;
4637
4638 ifm = nlmsg_data(nlh);
4639 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4640 if (!pfx)
4641 return -EINVAL;
4642
4643 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4644
4645 /* We ignore other flags so far. */
4646 ifa_flags &= IFA_F_MANAGETEMPADDR;
4647
4648 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4649 ifm->ifa_prefixlen);
4650 }
4651
4652 static int modify_prefix_route(struct inet6_ifaddr *ifp,
4653 unsigned long expires, u32 flags,
4654 bool modify_peer)
4655 {
4656 struct fib6_info *f6i;
4657 u32 prio;
4658
4659 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4660 ifp->prefix_len,
4661 ifp->idev->dev, 0, RTF_DEFAULT, true);
4662 if (!f6i)
4663 return -ENOENT;
4664
4665 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4666 if (f6i->fib6_metric != prio) {
4667 /* delete old one */
4668 ip6_del_rt(dev_net(ifp->idev->dev), f6i);
4669
4670 /* add new one */
4671 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4672 ifp->prefix_len,
4673 ifp->rt_priority, ifp->idev->dev,
4674 expires, flags, GFP_KERNEL);
4675 } else {
4676 if (!expires)
4677 fib6_clean_expires(f6i);
4678 else
4679 fib6_set_expires(f6i, expires);
4680
4681 fib6_info_release(f6i);
4682 }
4683
4684 return 0;
4685 }
4686
4687 static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg)
4688 {
4689 u32 flags;
4690 clock_t expires;
4691 unsigned long timeout;
4692 bool was_managetempaddr;
4693 bool had_prefixroute;
4694 bool new_peer = false;
4695
4696 ASSERT_RTNL();
4697
4698 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
4699 return -EINVAL;
4700
4701 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
4702 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4703 return -EINVAL;
4704
4705 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4706 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
4707
4708 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4709 if (addrconf_finite_timeout(timeout)) {
4710 expires = jiffies_to_clock_t(timeout * HZ);
4711 cfg->valid_lft = timeout;
4712 flags = RTF_EXPIRES;
4713 } else {
4714 expires = 0;
4715 flags = 0;
4716 cfg->ifa_flags |= IFA_F_PERMANENT;
4717 }
4718
4719 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4720 if (addrconf_finite_timeout(timeout)) {
4721 if (timeout == 0)
4722 cfg->ifa_flags |= IFA_F_DEPRECATED;
4723 cfg->preferred_lft = timeout;
4724 }
4725
4726 if (cfg->peer_pfx &&
4727 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) {
4728 if (!ipv6_addr_any(&ifp->peer_addr))
4729 cleanup_prefix_route(ifp, expires, true, true);
4730 new_peer = true;
4731 }
4732
4733 spin_lock_bh(&ifp->lock);
4734 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4735 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4736 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4737 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4738 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4739 IFA_F_NOPREFIXROUTE);
4740 ifp->flags |= cfg->ifa_flags;
4741 ifp->tstamp = jiffies;
4742 ifp->valid_lft = cfg->valid_lft;
4743 ifp->prefered_lft = cfg->preferred_lft;
4744
4745 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4746 ifp->rt_priority = cfg->rt_priority;
4747
4748 if (new_peer)
4749 ifp->peer_addr = *cfg->peer_pfx;
4750
4751 spin_unlock_bh(&ifp->lock);
4752 if (!(ifp->flags&IFA_F_TENTATIVE))
4753 ipv6_ifa_notify(0, ifp);
4754
4755 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
4756 int rc = -ENOENT;
4757
4758 if (had_prefixroute)
4759 rc = modify_prefix_route(ifp, expires, flags, false);
4760
4761 /* prefix route could have been deleted; if so restore it */
4762 if (rc == -ENOENT) {
4763 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4764 ifp->rt_priority, ifp->idev->dev,
4765 expires, flags, GFP_KERNEL);
4766 }
4767
4768 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr))
4769 rc = modify_prefix_route(ifp, expires, flags, true);
4770
4771 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) {
4772 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len,
4773 ifp->rt_priority, ifp->idev->dev,
4774 expires, flags, GFP_KERNEL);
4775 }
4776 } else if (had_prefixroute) {
4777 enum cleanup_prefix_rt_t action;
4778 unsigned long rt_expires;
4779
4780 write_lock_bh(&ifp->idev->lock);
4781 action = check_cleanup_prefix_route(ifp, &rt_expires);
4782 write_unlock_bh(&ifp->idev->lock);
4783
4784 if (action != CLEANUP_PREFIX_RT_NOP) {
4785 cleanup_prefix_route(ifp, rt_expires,
4786 action == CLEANUP_PREFIX_RT_DEL, false);
4787 }
4788 }
4789
4790 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4791 if (was_managetempaddr &&
4792 !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4793 cfg->valid_lft = 0;
4794 cfg->preferred_lft = 0;
4795 }
4796 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4797 cfg->preferred_lft, !was_managetempaddr,
4798 jiffies);
4799 }
4800
4801 addrconf_verify_rtnl();
4802
4803 return 0;
4804 }
4805
4806 static int
4807 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4808 struct netlink_ext_ack *extack)
4809 {
4810 struct net *net = sock_net(skb->sk);
4811 struct ifaddrmsg *ifm;
4812 struct nlattr *tb[IFA_MAX+1];
4813 struct in6_addr *peer_pfx;
4814 struct inet6_ifaddr *ifa;
4815 struct net_device *dev;
4816 struct inet6_dev *idev;
4817 struct ifa6_config cfg;
4818 int err;
4819
4820 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4821 ifa_ipv6_policy, extack);
4822 if (err < 0)
4823 return err;
4824
4825 memset(&cfg, 0, sizeof(cfg));
4826
4827 ifm = nlmsg_data(nlh);
4828 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4829 if (!cfg.pfx)
4830 return -EINVAL;
4831
4832 cfg.peer_pfx = peer_pfx;
4833 cfg.plen = ifm->ifa_prefixlen;
4834 if (tb[IFA_RT_PRIORITY])
4835 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4836
4837 cfg.valid_lft = INFINITY_LIFE_TIME;
4838 cfg.preferred_lft = INFINITY_LIFE_TIME;
4839
4840 if (tb[IFA_CACHEINFO]) {
4841 struct ifa_cacheinfo *ci;
4842
4843 ci = nla_data(tb[IFA_CACHEINFO]);
4844 cfg.valid_lft = ci->ifa_valid;
4845 cfg.preferred_lft = ci->ifa_prefered;
4846 }
4847
4848 dev = __dev_get_by_index(net, ifm->ifa_index);
4849 if (!dev)
4850 return -ENODEV;
4851
4852 if (tb[IFA_FLAGS])
4853 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
4854 else
4855 cfg.ifa_flags = ifm->ifa_flags;
4856
4857 /* We ignore other flags so far. */
4858 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
4859 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
4860 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
4861
4862 idev = ipv6_find_idev(dev);
4863 if (IS_ERR(idev))
4864 return PTR_ERR(idev);
4865
4866 if (!ipv6_allow_optimistic_dad(net, idev))
4867 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
4868
4869 if (cfg.ifa_flags & IFA_F_NODAD &&
4870 cfg.ifa_flags & IFA_F_OPTIMISTIC) {
4871 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4872 return -EINVAL;
4873 }
4874
4875 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
4876 if (!ifa) {
4877 /*
4878 * It would be best to check for !NLM_F_CREATE here but
4879 * userspace already relies on not having to provide this.
4880 */
4881 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
4882 }
4883
4884 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4885 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4886 err = -EEXIST;
4887 else
4888 err = inet6_addr_modify(ifa, &cfg);
4889
4890 in6_ifa_put(ifa);
4891
4892 return err;
4893 }
4894
4895 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4896 u8 scope, int ifindex)
4897 {
4898 struct ifaddrmsg *ifm;
4899
4900 ifm = nlmsg_data(nlh);
4901 ifm->ifa_family = AF_INET6;
4902 ifm->ifa_prefixlen = prefixlen;
4903 ifm->ifa_flags = flags;
4904 ifm->ifa_scope = scope;
4905 ifm->ifa_index = ifindex;
4906 }
4907
4908 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4909 unsigned long tstamp, u32 preferred, u32 valid)
4910 {
4911 struct ifa_cacheinfo ci;
4912
4913 ci.cstamp = cstamp_delta(cstamp);
4914 ci.tstamp = cstamp_delta(tstamp);
4915 ci.ifa_prefered = preferred;
4916 ci.ifa_valid = valid;
4917
4918 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4919 }
4920
4921 static inline int rt_scope(int ifa_scope)
4922 {
4923 if (ifa_scope & IFA_HOST)
4924 return RT_SCOPE_HOST;
4925 else if (ifa_scope & IFA_LINK)
4926 return RT_SCOPE_LINK;
4927 else if (ifa_scope & IFA_SITE)
4928 return RT_SCOPE_SITE;
4929 else
4930 return RT_SCOPE_UNIVERSE;
4931 }
4932
4933 static inline int inet6_ifaddr_msgsize(void)
4934 {
4935 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4936 + nla_total_size(16) /* IFA_LOCAL */
4937 + nla_total_size(16) /* IFA_ADDRESS */
4938 + nla_total_size(sizeof(struct ifa_cacheinfo))
4939 + nla_total_size(4) /* IFA_FLAGS */
4940 + nla_total_size(4) /* IFA_RT_PRIORITY */;
4941 }
4942
4943 enum addr_type_t {
4944 UNICAST_ADDR,
4945 MULTICAST_ADDR,
4946 ANYCAST_ADDR,
4947 };
4948
4949 struct inet6_fill_args {
4950 u32 portid;
4951 u32 seq;
4952 int event;
4953 unsigned int flags;
4954 int netnsid;
4955 int ifindex;
4956 enum addr_type_t type;
4957 };
4958
4959 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4960 struct inet6_fill_args *args)
4961 {
4962 struct nlmsghdr *nlh;
4963 u32 preferred, valid;
4964
4965 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
4966 sizeof(struct ifaddrmsg), args->flags);
4967 if (!nlh)
4968 return -EMSGSIZE;
4969
4970 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4971 ifa->idev->dev->ifindex);
4972
4973 if (args->netnsid >= 0 &&
4974 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
4975 goto error;
4976
4977 if (!((ifa->flags&IFA_F_PERMANENT) &&
4978 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4979 preferred = ifa->prefered_lft;
4980 valid = ifa->valid_lft;
4981 if (preferred != INFINITY_LIFE_TIME) {
4982 long tval = (jiffies - ifa->tstamp)/HZ;
4983 if (preferred > tval)
4984 preferred -= tval;
4985 else
4986 preferred = 0;
4987 if (valid != INFINITY_LIFE_TIME) {
4988 if (valid > tval)
4989 valid -= tval;
4990 else
4991 valid = 0;
4992 }
4993 }
4994 } else {
4995 preferred = INFINITY_LIFE_TIME;
4996 valid = INFINITY_LIFE_TIME;
4997 }
4998
4999 if (!ipv6_addr_any(&ifa->peer_addr)) {
5000 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
5001 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
5002 goto error;
5003 } else
5004 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
5005 goto error;
5006
5007 if (ifa->rt_priority &&
5008 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
5009 goto error;
5010
5011 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
5012 goto error;
5013
5014 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
5015 goto error;
5016
5017 nlmsg_end(skb, nlh);
5018 return 0;
5019
5020 error:
5021 nlmsg_cancel(skb, nlh);
5022 return -EMSGSIZE;
5023 }
5024
5025 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
5026 struct inet6_fill_args *args)
5027 {
5028 struct nlmsghdr *nlh;
5029 u8 scope = RT_SCOPE_UNIVERSE;
5030 int ifindex = ifmca->idev->dev->ifindex;
5031
5032 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
5033 scope = RT_SCOPE_SITE;
5034
5035 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5036 sizeof(struct ifaddrmsg), args->flags);
5037 if (!nlh)
5038 return -EMSGSIZE;
5039
5040 if (args->netnsid >= 0 &&
5041 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
5042 return -EMSGSIZE;
5043
5044 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5045 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
5046 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
5047 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5048 nlmsg_cancel(skb, nlh);
5049 return -EMSGSIZE;
5050 }
5051
5052 nlmsg_end(skb, nlh);
5053 return 0;
5054 }
5055
5056 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
5057 struct inet6_fill_args *args)
5058 {
5059 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
5060 int ifindex = dev ? dev->ifindex : 1;
5061 struct nlmsghdr *nlh;
5062 u8 scope = RT_SCOPE_UNIVERSE;
5063
5064 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
5065 scope = RT_SCOPE_SITE;
5066
5067 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5068 sizeof(struct ifaddrmsg), args->flags);
5069 if (!nlh)
5070 return -EMSGSIZE;
5071
5072 if (args->netnsid >= 0 &&
5073 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
5074 return -EMSGSIZE;
5075
5076 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5077 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
5078 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
5079 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5080 nlmsg_cancel(skb, nlh);
5081 return -EMSGSIZE;
5082 }
5083
5084 nlmsg_end(skb, nlh);
5085 return 0;
5086 }
5087
5088 /* called with rcu_read_lock() */
5089 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
5090 struct netlink_callback *cb, int s_ip_idx,
5091 struct inet6_fill_args *fillargs)
5092 {
5093 struct ifmcaddr6 *ifmca;
5094 struct ifacaddr6 *ifaca;
5095 int ip_idx = 0;
5096 int err = 1;
5097
5098 read_lock_bh(&idev->lock);
5099 switch (fillargs->type) {
5100 case UNICAST_ADDR: {
5101 struct inet6_ifaddr *ifa;
5102 fillargs->event = RTM_NEWADDR;
5103
5104 /* unicast address incl. temp addr */
5105 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5106 if (ip_idx < s_ip_idx)
5107 goto next;
5108 err = inet6_fill_ifaddr(skb, ifa, fillargs);
5109 if (err < 0)
5110 break;
5111 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5112 next:
5113 ip_idx++;
5114 }
5115 break;
5116 }
5117 case MULTICAST_ADDR:
5118 fillargs->event = RTM_GETMULTICAST;
5119
5120 /* multicast address */
5121 for (ifmca = idev->mc_list; ifmca;
5122 ifmca = ifmca->next, ip_idx++) {
5123 if (ip_idx < s_ip_idx)
5124 continue;
5125 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
5126 if (err < 0)
5127 break;
5128 }
5129 break;
5130 case ANYCAST_ADDR:
5131 fillargs->event = RTM_GETANYCAST;
5132 /* anycast address */
5133 for (ifaca = idev->ac_list; ifaca;
5134 ifaca = ifaca->aca_next, ip_idx++) {
5135 if (ip_idx < s_ip_idx)
5136 continue;
5137 err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
5138 if (err < 0)
5139 break;
5140 }
5141 break;
5142 default:
5143 break;
5144 }
5145 read_unlock_bh(&idev->lock);
5146 cb->args[2] = ip_idx;
5147 return err;
5148 }
5149
5150 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5151 struct inet6_fill_args *fillargs,
5152 struct net **tgt_net, struct sock *sk,
5153 struct netlink_callback *cb)
5154 {
5155 struct netlink_ext_ack *extack = cb->extack;
5156 struct nlattr *tb[IFA_MAX+1];
5157 struct ifaddrmsg *ifm;
5158 int err, i;
5159
5160 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5161 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5162 return -EINVAL;
5163 }
5164
5165 ifm = nlmsg_data(nlh);
5166 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5167 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5168 return -EINVAL;
5169 }
5170
5171 fillargs->ifindex = ifm->ifa_index;
5172 if (fillargs->ifindex) {
5173 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5174 fillargs->flags |= NLM_F_DUMP_FILTERED;
5175 }
5176
5177 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5178 ifa_ipv6_policy, extack);
5179 if (err < 0)
5180 return err;
5181
5182 for (i = 0; i <= IFA_MAX; ++i) {
5183 if (!tb[i])
5184 continue;
5185
5186 if (i == IFA_TARGET_NETNSID) {
5187 struct net *net;
5188
5189 fillargs->netnsid = nla_get_s32(tb[i]);
5190 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5191 if (IS_ERR(net)) {
5192 fillargs->netnsid = -1;
5193 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5194 return PTR_ERR(net);
5195 }
5196 *tgt_net = net;
5197 } else {
5198 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5199 return -EINVAL;
5200 }
5201 }
5202
5203 return 0;
5204 }
5205
5206 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5207 enum addr_type_t type)
5208 {
5209 const struct nlmsghdr *nlh = cb->nlh;
5210 struct inet6_fill_args fillargs = {
5211 .portid = NETLINK_CB(cb->skb).portid,
5212 .seq = cb->nlh->nlmsg_seq,
5213 .flags = NLM_F_MULTI,
5214 .netnsid = -1,
5215 .type = type,
5216 };
5217 struct net *net = sock_net(skb->sk);
5218 struct net *tgt_net = net;
5219 int idx, s_idx, s_ip_idx;
5220 int h, s_h;
5221 struct net_device *dev;
5222 struct inet6_dev *idev;
5223 struct hlist_head *head;
5224 int err = 0;
5225
5226 s_h = cb->args[0];
5227 s_idx = idx = cb->args[1];
5228 s_ip_idx = cb->args[2];
5229
5230 if (cb->strict_check) {
5231 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
5232 skb->sk, cb);
5233 if (err < 0)
5234 goto put_tgt_net;
5235
5236 err = 0;
5237 if (fillargs.ifindex) {
5238 dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
5239 if (!dev) {
5240 err = -ENODEV;
5241 goto put_tgt_net;
5242 }
5243 idev = __in6_dev_get(dev);
5244 if (idev) {
5245 err = in6_dump_addrs(idev, skb, cb, s_ip_idx,
5246 &fillargs);
5247 if (err > 0)
5248 err = 0;
5249 }
5250 goto put_tgt_net;
5251 }
5252 }
5253
5254 rcu_read_lock();
5255 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq;
5256 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5257 idx = 0;
5258 head = &tgt_net->dev_index_head[h];
5259 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5260 if (idx < s_idx)
5261 goto cont;
5262 if (h > s_h || idx > s_idx)
5263 s_ip_idx = 0;
5264 idev = __in6_dev_get(dev);
5265 if (!idev)
5266 goto cont;
5267
5268 if (in6_dump_addrs(idev, skb, cb, s_ip_idx,
5269 &fillargs) < 0)
5270 goto done;
5271 cont:
5272 idx++;
5273 }
5274 }
5275 done:
5276 rcu_read_unlock();
5277 cb->args[0] = h;
5278 cb->args[1] = idx;
5279 put_tgt_net:
5280 if (fillargs.netnsid >= 0)
5281 put_net(tgt_net);
5282
5283 return skb->len ? : err;
5284 }
5285
5286 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5287 {
5288 enum addr_type_t type = UNICAST_ADDR;
5289
5290 return inet6_dump_addr(skb, cb, type);
5291 }
5292
5293 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5294 {
5295 enum addr_type_t type = MULTICAST_ADDR;
5296
5297 return inet6_dump_addr(skb, cb, type);
5298 }
5299
5300
5301 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5302 {
5303 enum addr_type_t type = ANYCAST_ADDR;
5304
5305 return inet6_dump_addr(skb, cb, type);
5306 }
5307
5308 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
5309 const struct nlmsghdr *nlh,
5310 struct nlattr **tb,
5311 struct netlink_ext_ack *extack)
5312 {
5313 struct ifaddrmsg *ifm;
5314 int i, err;
5315
5316 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5317 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
5318 return -EINVAL;
5319 }
5320
5321 if (!netlink_strict_get_check(skb))
5322 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5323 ifa_ipv6_policy, extack);
5324
5325 ifm = nlmsg_data(nlh);
5326 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5327 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
5328 return -EINVAL;
5329 }
5330
5331 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5332 ifa_ipv6_policy, extack);
5333 if (err)
5334 return err;
5335
5336 for (i = 0; i <= IFA_MAX; i++) {
5337 if (!tb[i])
5338 continue;
5339
5340 switch (i) {
5341 case IFA_TARGET_NETNSID:
5342 case IFA_ADDRESS:
5343 case IFA_LOCAL:
5344 break;
5345 default:
5346 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
5347 return -EINVAL;
5348 }
5349 }
5350
5351 return 0;
5352 }
5353
5354 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5355 struct netlink_ext_ack *extack)
5356 {
5357 struct net *net = sock_net(in_skb->sk);
5358 struct inet6_fill_args fillargs = {
5359 .portid = NETLINK_CB(in_skb).portid,
5360 .seq = nlh->nlmsg_seq,
5361 .event = RTM_NEWADDR,
5362 .flags = 0,
5363 .netnsid = -1,
5364 };
5365 struct net *tgt_net = net;
5366 struct ifaddrmsg *ifm;
5367 struct nlattr *tb[IFA_MAX+1];
5368 struct in6_addr *addr = NULL, *peer;
5369 struct net_device *dev = NULL;
5370 struct inet6_ifaddr *ifa;
5371 struct sk_buff *skb;
5372 int err;
5373
5374 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
5375 if (err < 0)
5376 return err;
5377
5378 if (tb[IFA_TARGET_NETNSID]) {
5379 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
5380
5381 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
5382 fillargs.netnsid);
5383 if (IS_ERR(tgt_net))
5384 return PTR_ERR(tgt_net);
5385 }
5386
5387 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
5388 if (!addr)
5389 return -EINVAL;
5390
5391 ifm = nlmsg_data(nlh);
5392 if (ifm->ifa_index)
5393 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
5394
5395 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
5396 if (!ifa) {
5397 err = -EADDRNOTAVAIL;
5398 goto errout;
5399 }
5400
5401 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5402 if (!skb) {
5403 err = -ENOBUFS;
5404 goto errout_ifa;
5405 }
5406
5407 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5408 if (err < 0) {
5409 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5410 WARN_ON(err == -EMSGSIZE);
5411 kfree_skb(skb);
5412 goto errout_ifa;
5413 }
5414 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
5415 errout_ifa:
5416 in6_ifa_put(ifa);
5417 errout:
5418 if (dev)
5419 dev_put(dev);
5420 if (fillargs.netnsid >= 0)
5421 put_net(tgt_net);
5422
5423 return err;
5424 }
5425
5426 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5427 {
5428 struct sk_buff *skb;
5429 struct net *net = dev_net(ifa->idev->dev);
5430 struct inet6_fill_args fillargs = {
5431 .portid = 0,
5432 .seq = 0,
5433 .event = event,
5434 .flags = 0,
5435 .netnsid = -1,
5436 };
5437 int err = -ENOBUFS;
5438
5439 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5440 if (!skb)
5441 goto errout;
5442
5443 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5444 if (err < 0) {
5445 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5446 WARN_ON(err == -EMSGSIZE);
5447 kfree_skb(skb);
5448 goto errout;
5449 }
5450 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5451 return;
5452 errout:
5453 if (err < 0)
5454 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5455 }
5456
5457 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
5458 __s32 *array, int bytes)
5459 {
5460 BUG_ON(bytes < (DEVCONF_MAX * 4));
5461
5462 memset(array, 0, bytes);
5463 array[DEVCONF_FORWARDING] = cnf->forwarding;
5464 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5465 array[DEVCONF_MTU6] = cnf->mtu6;
5466 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5467 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5468 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5469 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5470 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
5471 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5472 jiffies_to_msecs(cnf->rtr_solicit_interval);
5473 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5474 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
5475 array[DEVCONF_RTR_SOLICIT_DELAY] =
5476 jiffies_to_msecs(cnf->rtr_solicit_delay);
5477 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
5478 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5479 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5480 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5481 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5482 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5483 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5484 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5485 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5486 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5487 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5488 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5489 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5490 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5491 #ifdef CONFIG_IPV6_ROUTER_PREF
5492 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5493 array[DEVCONF_RTR_PROBE_INTERVAL] =
5494 jiffies_to_msecs(cnf->rtr_probe_interval);
5495 #ifdef CONFIG_IPV6_ROUTE_INFO
5496 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5497 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5498 #endif
5499 #endif
5500 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5501 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5502 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5503 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5504 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5505 #endif
5506 #ifdef CONFIG_IPV6_MROUTE
5507 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5508 #endif
5509 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5510 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5511 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5512 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5513 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5514 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5515 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5516 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5517 /* we omit DEVCONF_STABLE_SECRET for now */
5518 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5519 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5520 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5521 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5522 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5523 #ifdef CONFIG_IPV6_SEG6_HMAC
5524 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5525 #endif
5526 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5527 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5528 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5529 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
5530 array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled;
5531 }
5532
5533 static inline size_t inet6_ifla6_size(void)
5534 {
5535 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5536 + nla_total_size(sizeof(struct ifla_cacheinfo))
5537 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5538 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5539 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5540 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5541 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
5542 + 0;
5543 }
5544
5545 static inline size_t inet6_if_nlmsg_size(void)
5546 {
5547 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5548 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5549 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5550 + nla_total_size(4) /* IFLA_MTU */
5551 + nla_total_size(4) /* IFLA_LINK */
5552 + nla_total_size(1) /* IFLA_OPERSTATE */
5553 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5554 }
5555
5556 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5557 int bytes)
5558 {
5559 int i;
5560 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5561 BUG_ON(pad < 0);
5562
5563 /* Use put_unaligned() because stats may not be aligned for u64. */
5564 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5565 for (i = 1; i < ICMP6_MIB_MAX; i++)
5566 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5567
5568 memset(&stats[ICMP6_MIB_MAX], 0, pad);
5569 }
5570
5571 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5572 int bytes, size_t syncpoff)
5573 {
5574 int i, c;
5575 u64 buff[IPSTATS_MIB_MAX];
5576 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5577
5578 BUG_ON(pad < 0);
5579
5580 memset(buff, 0, sizeof(buff));
5581 buff[0] = IPSTATS_MIB_MAX;
5582
5583 for_each_possible_cpu(c) {
5584 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5585 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5586 }
5587
5588 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5589 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5590 }
5591
5592 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5593 int bytes)
5594 {
5595 switch (attrtype) {
5596 case IFLA_INET6_STATS:
5597 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5598 offsetof(struct ipstats_mib, syncp));
5599 break;
5600 case IFLA_INET6_ICMP6STATS:
5601 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5602 break;
5603 }
5604 }
5605
5606 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5607 u32 ext_filter_mask)
5608 {
5609 struct nlattr *nla;
5610 struct ifla_cacheinfo ci;
5611
5612 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5613 goto nla_put_failure;
5614 ci.max_reasm_len = IPV6_MAXPLEN;
5615 ci.tstamp = cstamp_delta(idev->tstamp);
5616 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5617 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5618 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5619 goto nla_put_failure;
5620 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5621 if (!nla)
5622 goto nla_put_failure;
5623 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5624
5625 /* XXX - MC not implemented */
5626
5627 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5628 return 0;
5629
5630 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5631 if (!nla)
5632 goto nla_put_failure;
5633 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5634
5635 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5636 if (!nla)
5637 goto nla_put_failure;
5638 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5639
5640 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5641 if (!nla)
5642 goto nla_put_failure;
5643 read_lock_bh(&idev->lock);
5644 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5645 read_unlock_bh(&idev->lock);
5646
5647 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5648 goto nla_put_failure;
5649
5650 return 0;
5651
5652 nla_put_failure:
5653 return -EMSGSIZE;
5654 }
5655
5656 static size_t inet6_get_link_af_size(const struct net_device *dev,
5657 u32 ext_filter_mask)
5658 {
5659 if (!__in6_dev_get(dev))
5660 return 0;
5661
5662 return inet6_ifla6_size();
5663 }
5664
5665 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5666 u32 ext_filter_mask)
5667 {
5668 struct inet6_dev *idev = __in6_dev_get(dev);
5669
5670 if (!idev)
5671 return -ENODATA;
5672
5673 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5674 return -EMSGSIZE;
5675
5676 return 0;
5677 }
5678
5679 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5680 {
5681 struct inet6_ifaddr *ifp;
5682 struct net_device *dev = idev->dev;
5683 bool clear_token, update_rs = false;
5684 struct in6_addr ll_addr;
5685
5686 ASSERT_RTNL();
5687
5688 if (!token)
5689 return -EINVAL;
5690 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5691 return -EINVAL;
5692 if (!ipv6_accept_ra(idev))
5693 return -EINVAL;
5694 if (idev->cnf.rtr_solicits == 0)
5695 return -EINVAL;
5696
5697 write_lock_bh(&idev->lock);
5698
5699 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5700 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5701
5702 write_unlock_bh(&idev->lock);
5703
5704 clear_token = ipv6_addr_any(token);
5705 if (clear_token)
5706 goto update_lft;
5707
5708 if (!idev->dead && (idev->if_flags & IF_READY) &&
5709 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5710 IFA_F_OPTIMISTIC)) {
5711 /* If we're not ready, then normal ifup will take care
5712 * of this. Otherwise, we need to request our rs here.
5713 */
5714 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5715 update_rs = true;
5716 }
5717
5718 update_lft:
5719 write_lock_bh(&idev->lock);
5720
5721 if (update_rs) {
5722 idev->if_flags |= IF_RS_SENT;
5723 idev->rs_interval = rfc3315_s14_backoff_init(
5724 idev->cnf.rtr_solicit_interval);
5725 idev->rs_probes = 1;
5726 addrconf_mod_rs_timer(idev, idev->rs_interval);
5727 }
5728
5729 /* Well, that's kinda nasty ... */
5730 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5731 spin_lock(&ifp->lock);
5732 if (ifp->tokenized) {
5733 ifp->valid_lft = 0;
5734 ifp->prefered_lft = 0;
5735 }
5736 spin_unlock(&ifp->lock);
5737 }
5738
5739 write_unlock_bh(&idev->lock);
5740 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5741 addrconf_verify_rtnl();
5742 return 0;
5743 }
5744
5745 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5746 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5747 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5748 };
5749
5750 static int check_addr_gen_mode(int mode)
5751 {
5752 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5753 mode != IN6_ADDR_GEN_MODE_NONE &&
5754 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5755 mode != IN6_ADDR_GEN_MODE_RANDOM)
5756 return -EINVAL;
5757 return 1;
5758 }
5759
5760 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5761 int mode)
5762 {
5763 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5764 !idev->cnf.stable_secret.initialized &&
5765 !net->ipv6.devconf_dflt->stable_secret.initialized)
5766 return -EINVAL;
5767 return 1;
5768 }
5769
5770 static int inet6_validate_link_af(const struct net_device *dev,
5771 const struct nlattr *nla)
5772 {
5773 struct nlattr *tb[IFLA_INET6_MAX + 1];
5774 struct inet6_dev *idev = NULL;
5775 int err;
5776
5777 if (dev) {
5778 idev = __in6_dev_get(dev);
5779 if (!idev)
5780 return -EAFNOSUPPORT;
5781 }
5782
5783 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
5784 inet6_af_policy, NULL);
5785 if (err)
5786 return err;
5787
5788 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
5789 return -EINVAL;
5790
5791 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5792 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5793
5794 if (check_addr_gen_mode(mode) < 0)
5795 return -EINVAL;
5796 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0)
5797 return -EINVAL;
5798 }
5799
5800 return 0;
5801 }
5802
5803 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5804 {
5805 struct inet6_dev *idev = __in6_dev_get(dev);
5806 struct nlattr *tb[IFLA_INET6_MAX + 1];
5807 int err;
5808
5809 if (!idev)
5810 return -EAFNOSUPPORT;
5811
5812 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5813 BUG();
5814
5815 if (tb[IFLA_INET6_TOKEN]) {
5816 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5817 if (err)
5818 return err;
5819 }
5820
5821 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5822 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5823
5824 idev->cnf.addr_gen_mode = mode;
5825 }
5826
5827 return 0;
5828 }
5829
5830 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5831 u32 portid, u32 seq, int event, unsigned int flags)
5832 {
5833 struct net_device *dev = idev->dev;
5834 struct ifinfomsg *hdr;
5835 struct nlmsghdr *nlh;
5836 void *protoinfo;
5837
5838 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5839 if (!nlh)
5840 return -EMSGSIZE;
5841
5842 hdr = nlmsg_data(nlh);
5843 hdr->ifi_family = AF_INET6;
5844 hdr->__ifi_pad = 0;
5845 hdr->ifi_type = dev->type;
5846 hdr->ifi_index = dev->ifindex;
5847 hdr->ifi_flags = dev_get_flags(dev);
5848 hdr->ifi_change = 0;
5849
5850 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5851 (dev->addr_len &&
5852 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5853 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5854 (dev->ifindex != dev_get_iflink(dev) &&
5855 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5856 nla_put_u8(skb, IFLA_OPERSTATE,
5857 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5858 goto nla_put_failure;
5859 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO);
5860 if (!protoinfo)
5861 goto nla_put_failure;
5862
5863 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5864 goto nla_put_failure;
5865
5866 nla_nest_end(skb, protoinfo);
5867 nlmsg_end(skb, nlh);
5868 return 0;
5869
5870 nla_put_failure:
5871 nlmsg_cancel(skb, nlh);
5872 return -EMSGSIZE;
5873 }
5874
5875 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
5876 struct netlink_ext_ack *extack)
5877 {
5878 struct ifinfomsg *ifm;
5879
5880 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5881 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
5882 return -EINVAL;
5883 }
5884
5885 if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
5886 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
5887 return -EINVAL;
5888 }
5889
5890 ifm = nlmsg_data(nlh);
5891 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
5892 ifm->ifi_change || ifm->ifi_index) {
5893 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
5894 return -EINVAL;
5895 }
5896
5897 return 0;
5898 }
5899
5900 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5901 {
5902 struct net *net = sock_net(skb->sk);
5903 int h, s_h;
5904 int idx = 0, s_idx;
5905 struct net_device *dev;
5906 struct inet6_dev *idev;
5907 struct hlist_head *head;
5908
5909 /* only requests using strict checking can pass data to
5910 * influence the dump
5911 */
5912 if (cb->strict_check) {
5913 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
5914
5915 if (err < 0)
5916 return err;
5917 }
5918
5919 s_h = cb->args[0];
5920 s_idx = cb->args[1];
5921
5922 rcu_read_lock();
5923 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5924 idx = 0;
5925 head = &net->dev_index_head[h];
5926 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5927 if (idx < s_idx)
5928 goto cont;
5929 idev = __in6_dev_get(dev);
5930 if (!idev)
5931 goto cont;
5932 if (inet6_fill_ifinfo(skb, idev,
5933 NETLINK_CB(cb->skb).portid,
5934 cb->nlh->nlmsg_seq,
5935 RTM_NEWLINK, NLM_F_MULTI) < 0)
5936 goto out;
5937 cont:
5938 idx++;
5939 }
5940 }
5941 out:
5942 rcu_read_unlock();
5943 cb->args[1] = idx;
5944 cb->args[0] = h;
5945
5946 return skb->len;
5947 }
5948
5949 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5950 {
5951 struct sk_buff *skb;
5952 struct net *net = dev_net(idev->dev);
5953 int err = -ENOBUFS;
5954
5955 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5956 if (!skb)
5957 goto errout;
5958
5959 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5960 if (err < 0) {
5961 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5962 WARN_ON(err == -EMSGSIZE);
5963 kfree_skb(skb);
5964 goto errout;
5965 }
5966 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5967 return;
5968 errout:
5969 if (err < 0)
5970 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5971 }
5972
5973 static inline size_t inet6_prefix_nlmsg_size(void)
5974 {
5975 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5976 + nla_total_size(sizeof(struct in6_addr))
5977 + nla_total_size(sizeof(struct prefix_cacheinfo));
5978 }
5979
5980 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5981 struct prefix_info *pinfo, u32 portid, u32 seq,
5982 int event, unsigned int flags)
5983 {
5984 struct prefixmsg *pmsg;
5985 struct nlmsghdr *nlh;
5986 struct prefix_cacheinfo ci;
5987
5988 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5989 if (!nlh)
5990 return -EMSGSIZE;
5991
5992 pmsg = nlmsg_data(nlh);
5993 pmsg->prefix_family = AF_INET6;
5994 pmsg->prefix_pad1 = 0;
5995 pmsg->prefix_pad2 = 0;
5996 pmsg->prefix_ifindex = idev->dev->ifindex;
5997 pmsg->prefix_len = pinfo->prefix_len;
5998 pmsg->prefix_type = pinfo->type;
5999 pmsg->prefix_pad3 = 0;
6000 pmsg->prefix_flags = 0;
6001 if (pinfo->onlink)
6002 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
6003 if (pinfo->autoconf)
6004 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
6005
6006 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
6007 goto nla_put_failure;
6008 ci.preferred_time = ntohl(pinfo->prefered);
6009 ci.valid_time = ntohl(pinfo->valid);
6010 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
6011 goto nla_put_failure;
6012 nlmsg_end(skb, nlh);
6013 return 0;
6014
6015 nla_put_failure:
6016 nlmsg_cancel(skb, nlh);
6017 return -EMSGSIZE;
6018 }
6019
6020 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
6021 struct prefix_info *pinfo)
6022 {
6023 struct sk_buff *skb;
6024 struct net *net = dev_net(idev->dev);
6025 int err = -ENOBUFS;
6026
6027 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
6028 if (!skb)
6029 goto errout;
6030
6031 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
6032 if (err < 0) {
6033 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
6034 WARN_ON(err == -EMSGSIZE);
6035 kfree_skb(skb);
6036 goto errout;
6037 }
6038 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
6039 return;
6040 errout:
6041 if (err < 0)
6042 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
6043 }
6044
6045 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6046 {
6047 struct net *net = dev_net(ifp->idev->dev);
6048
6049 if (event)
6050 ASSERT_RTNL();
6051
6052 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
6053
6054 switch (event) {
6055 case RTM_NEWADDR:
6056 /*
6057 * If the address was optimistic we inserted the route at the
6058 * start of our DAD process, so we don't need to do it again.
6059 * If the device was taken down in the middle of the DAD
6060 * cycle there is a race where we could get here without a
6061 * host route, so nothing to insert. That will be fixed when
6062 * the device is brought up.
6063 */
6064 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) {
6065 ip6_ins_rt(net, ifp->rt);
6066 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) {
6067 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n",
6068 &ifp->addr, ifp->idev->dev->name);
6069 }
6070
6071 if (ifp->idev->cnf.forwarding)
6072 addrconf_join_anycast(ifp);
6073 if (!ipv6_addr_any(&ifp->peer_addr))
6074 addrconf_prefix_route(&ifp->peer_addr, 128,
6075 ifp->rt_priority, ifp->idev->dev,
6076 0, 0, GFP_ATOMIC);
6077 break;
6078 case RTM_DELADDR:
6079 if (ifp->idev->cnf.forwarding)
6080 addrconf_leave_anycast(ifp);
6081 addrconf_leave_solict(ifp->idev, &ifp->addr);
6082 if (!ipv6_addr_any(&ifp->peer_addr)) {
6083 struct fib6_info *rt;
6084
6085 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
6086 ifp->idev->dev, 0, 0,
6087 false);
6088 if (rt)
6089 ip6_del_rt(net, rt);
6090 }
6091 if (ifp->rt) {
6092 ip6_del_rt(net, ifp->rt);
6093 ifp->rt = NULL;
6094 }
6095 rt_genid_bump_ipv6(net);
6096 break;
6097 }
6098 atomic_inc(&net->ipv6.dev_addr_genid);
6099 }
6100
6101 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6102 {
6103 rcu_read_lock_bh();
6104 if (likely(ifp->idev->dead == 0))
6105 __ipv6_ifa_notify(event, ifp);
6106 rcu_read_unlock_bh();
6107 }
6108
6109 #ifdef CONFIG_SYSCTL
6110
6111 static int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
6112 void *buffer, size_t *lenp, loff_t *ppos)
6113 {
6114 int *valp = ctl->data;
6115 int val = *valp;
6116 loff_t pos = *ppos;
6117 struct ctl_table lctl;
6118 int ret;
6119
6120 /*
6121 * ctl->data points to idev->cnf.forwarding, we should
6122 * not modify it until we get the rtnl lock.
6123 */
6124 lctl = *ctl;
6125 lctl.data = &val;
6126
6127 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6128
6129 if (write)
6130 ret = addrconf_fixup_forwarding(ctl, valp, val);
6131 if (ret)
6132 *ppos = pos;
6133 return ret;
6134 }
6135
6136 static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
6137 void *buffer, size_t *lenp, loff_t *ppos)
6138 {
6139 struct inet6_dev *idev = ctl->extra1;
6140 int min_mtu = IPV6_MIN_MTU;
6141 struct ctl_table lctl;
6142
6143 lctl = *ctl;
6144 lctl.extra1 = &min_mtu;
6145 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
6146
6147 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
6148 }
6149
6150 static void dev_disable_change(struct inet6_dev *idev)
6151 {
6152 struct netdev_notifier_info info;
6153
6154 if (!idev || !idev->dev)
6155 return;
6156
6157 netdev_notifier_info_init(&info, idev->dev);
6158 if (idev->cnf.disable_ipv6)
6159 addrconf_notify(NULL, NETDEV_DOWN, &info);
6160 else
6161 addrconf_notify(NULL, NETDEV_UP, &info);
6162 }
6163
6164 static void addrconf_disable_change(struct net *net, __s32 newf)
6165 {
6166 struct net_device *dev;
6167 struct inet6_dev *idev;
6168
6169 for_each_netdev(net, dev) {
6170 idev = __in6_dev_get(dev);
6171 if (idev) {
6172 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
6173 idev->cnf.disable_ipv6 = newf;
6174 if (changed)
6175 dev_disable_change(idev);
6176 }
6177 }
6178 }
6179
6180 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
6181 {
6182 struct net *net;
6183 int old;
6184
6185 if (!rtnl_trylock())
6186 return restart_syscall();
6187
6188 net = (struct net *)table->extra2;
6189 old = *p;
6190 *p = newf;
6191
6192 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
6193 rtnl_unlock();
6194 return 0;
6195 }
6196
6197 if (p == &net->ipv6.devconf_all->disable_ipv6) {
6198 net->ipv6.devconf_dflt->disable_ipv6 = newf;
6199 addrconf_disable_change(net, newf);
6200 } else if ((!newf) ^ (!old))
6201 dev_disable_change((struct inet6_dev *)table->extra1);
6202
6203 rtnl_unlock();
6204 return 0;
6205 }
6206
6207 static int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
6208 void *buffer, size_t *lenp, loff_t *ppos)
6209 {
6210 int *valp = ctl->data;
6211 int val = *valp;
6212 loff_t pos = *ppos;
6213 struct ctl_table lctl;
6214 int ret;
6215
6216 /*
6217 * ctl->data points to idev->cnf.disable_ipv6, we should
6218 * not modify it until we get the rtnl lock.
6219 */
6220 lctl = *ctl;
6221 lctl.data = &val;
6222
6223 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6224
6225 if (write)
6226 ret = addrconf_disable_ipv6(ctl, valp, val);
6227 if (ret)
6228 *ppos = pos;
6229 return ret;
6230 }
6231
6232 static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
6233 void *buffer, size_t *lenp, loff_t *ppos)
6234 {
6235 int *valp = ctl->data;
6236 int ret;
6237 int old, new;
6238
6239 old = *valp;
6240 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6241 new = *valp;
6242
6243 if (write && old != new) {
6244 struct net *net = ctl->extra2;
6245
6246 if (!rtnl_trylock())
6247 return restart_syscall();
6248
6249 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
6250 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6251 NETCONFA_PROXY_NEIGH,
6252 NETCONFA_IFINDEX_DEFAULT,
6253 net->ipv6.devconf_dflt);
6254 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
6255 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6256 NETCONFA_PROXY_NEIGH,
6257 NETCONFA_IFINDEX_ALL,
6258 net->ipv6.devconf_all);
6259 else {
6260 struct inet6_dev *idev = ctl->extra1;
6261
6262 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6263 NETCONFA_PROXY_NEIGH,
6264 idev->dev->ifindex,
6265 &idev->cnf);
6266 }
6267 rtnl_unlock();
6268 }
6269
6270 return ret;
6271 }
6272
6273 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
6274 void *buffer, size_t *lenp,
6275 loff_t *ppos)
6276 {
6277 int ret = 0;
6278 u32 new_val;
6279 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
6280 struct net *net = (struct net *)ctl->extra2;
6281 struct ctl_table tmp = {
6282 .data = &new_val,
6283 .maxlen = sizeof(new_val),
6284 .mode = ctl->mode,
6285 };
6286
6287 if (!rtnl_trylock())
6288 return restart_syscall();
6289
6290 new_val = *((u32 *)ctl->data);
6291
6292 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6293 if (ret != 0)
6294 goto out;
6295
6296 if (write) {
6297 if (check_addr_gen_mode(new_val) < 0) {
6298 ret = -EINVAL;
6299 goto out;
6300 }
6301
6302 if (idev) {
6303 if (check_stable_privacy(idev, net, new_val) < 0) {
6304 ret = -EINVAL;
6305 goto out;
6306 }
6307
6308 if (idev->cnf.addr_gen_mode != new_val) {
6309 idev->cnf.addr_gen_mode = new_val;
6310 addrconf_dev_config(idev->dev);
6311 }
6312 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6313 struct net_device *dev;
6314
6315 net->ipv6.devconf_dflt->addr_gen_mode = new_val;
6316 for_each_netdev(net, dev) {
6317 idev = __in6_dev_get(dev);
6318 if (idev &&
6319 idev->cnf.addr_gen_mode != new_val) {
6320 idev->cnf.addr_gen_mode = new_val;
6321 addrconf_dev_config(idev->dev);
6322 }
6323 }
6324 }
6325
6326 *((u32 *)ctl->data) = new_val;
6327 }
6328
6329 out:
6330 rtnl_unlock();
6331
6332 return ret;
6333 }
6334
6335 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
6336 void *buffer, size_t *lenp,
6337 loff_t *ppos)
6338 {
6339 int err;
6340 struct in6_addr addr;
6341 char str[IPV6_MAX_STRLEN];
6342 struct ctl_table lctl = *ctl;
6343 struct net *net = ctl->extra2;
6344 struct ipv6_stable_secret *secret = ctl->data;
6345
6346 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6347 return -EIO;
6348
6349 lctl.maxlen = IPV6_MAX_STRLEN;
6350 lctl.data = str;
6351
6352 if (!rtnl_trylock())
6353 return restart_syscall();
6354
6355 if (!write && !secret->initialized) {
6356 err = -EIO;
6357 goto out;
6358 }
6359
6360 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6361 if (err >= sizeof(str)) {
6362 err = -EIO;
6363 goto out;
6364 }
6365
6366 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6367 if (err || !write)
6368 goto out;
6369
6370 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6371 err = -EIO;
6372 goto out;
6373 }
6374
6375 secret->initialized = true;
6376 secret->secret = addr;
6377
6378 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6379 struct net_device *dev;
6380
6381 for_each_netdev(net, dev) {
6382 struct inet6_dev *idev = __in6_dev_get(dev);
6383
6384 if (idev) {
6385 idev->cnf.addr_gen_mode =
6386 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6387 }
6388 }
6389 } else {
6390 struct inet6_dev *idev = ctl->extra1;
6391
6392 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6393 }
6394
6395 out:
6396 rtnl_unlock();
6397
6398 return err;
6399 }
6400
6401 static
6402 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
6403 int write, void *buffer,
6404 size_t *lenp,
6405 loff_t *ppos)
6406 {
6407 int *valp = ctl->data;
6408 int val = *valp;
6409 loff_t pos = *ppos;
6410 struct ctl_table lctl;
6411 int ret;
6412
6413 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6414 * we should not modify it until we get the rtnl lock.
6415 */
6416 lctl = *ctl;
6417 lctl.data = &val;
6418
6419 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6420
6421 if (write)
6422 ret = addrconf_fixup_linkdown(ctl, valp, val);
6423 if (ret)
6424 *ppos = pos;
6425 return ret;
6426 }
6427
6428 static
6429 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6430 {
6431 if (rt) {
6432 if (action)
6433 rt->dst.flags |= DST_NOPOLICY;
6434 else
6435 rt->dst.flags &= ~DST_NOPOLICY;
6436 }
6437 }
6438
6439 static
6440 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6441 {
6442 struct inet6_ifaddr *ifa;
6443
6444 read_lock_bh(&idev->lock);
6445 list_for_each_entry(ifa, &idev->addr_list, if_list) {
6446 spin_lock(&ifa->lock);
6447 if (ifa->rt) {
6448 /* host routes only use builtin fib6_nh */
6449 struct fib6_nh *nh = ifa->rt->fib6_nh;
6450 int cpu;
6451
6452 rcu_read_lock();
6453 ifa->rt->dst_nopolicy = val ? true : false;
6454 if (nh->rt6i_pcpu) {
6455 for_each_possible_cpu(cpu) {
6456 struct rt6_info **rtp;
6457
6458 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu);
6459 addrconf_set_nopolicy(*rtp, val);
6460 }
6461 }
6462 rcu_read_unlock();
6463 }
6464 spin_unlock(&ifa->lock);
6465 }
6466 read_unlock_bh(&idev->lock);
6467 }
6468
6469 static
6470 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6471 {
6472 struct inet6_dev *idev;
6473 struct net *net;
6474
6475 if (!rtnl_trylock())
6476 return restart_syscall();
6477
6478 *valp = val;
6479
6480 net = (struct net *)ctl->extra2;
6481 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6482 rtnl_unlock();
6483 return 0;
6484 }
6485
6486 if (valp == &net->ipv6.devconf_all->disable_policy) {
6487 struct net_device *dev;
6488
6489 for_each_netdev(net, dev) {
6490 idev = __in6_dev_get(dev);
6491 if (idev)
6492 addrconf_disable_policy_idev(idev, val);
6493 }
6494 } else {
6495 idev = (struct inet6_dev *)ctl->extra1;
6496 addrconf_disable_policy_idev(idev, val);
6497 }
6498
6499 rtnl_unlock();
6500 return 0;
6501 }
6502
6503 static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6504 void *buffer, size_t *lenp, loff_t *ppos)
6505 {
6506 int *valp = ctl->data;
6507 int val = *valp;
6508 loff_t pos = *ppos;
6509 struct ctl_table lctl;
6510 int ret;
6511
6512 lctl = *ctl;
6513 lctl.data = &val;
6514 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6515
6516 if (write && (*valp != val))
6517 ret = addrconf_disable_policy(ctl, valp, val);
6518
6519 if (ret)
6520 *ppos = pos;
6521
6522 return ret;
6523 }
6524
6525 static int minus_one = -1;
6526 static const int two_five_five = 255;
6527
6528 static const struct ctl_table addrconf_sysctl[] = {
6529 {
6530 .procname = "forwarding",
6531 .data = &ipv6_devconf.forwarding,
6532 .maxlen = sizeof(int),
6533 .mode = 0644,
6534 .proc_handler = addrconf_sysctl_forward,
6535 },
6536 {
6537 .procname = "hop_limit",
6538 .data = &ipv6_devconf.hop_limit,
6539 .maxlen = sizeof(int),
6540 .mode = 0644,
6541 .proc_handler = proc_dointvec_minmax,
6542 .extra1 = (void *)SYSCTL_ONE,
6543 .extra2 = (void *)&two_five_five,
6544 },
6545 {
6546 .procname = "mtu",
6547 .data = &ipv6_devconf.mtu6,
6548 .maxlen = sizeof(int),
6549 .mode = 0644,
6550 .proc_handler = addrconf_sysctl_mtu,
6551 },
6552 {
6553 .procname = "accept_ra",
6554 .data = &ipv6_devconf.accept_ra,
6555 .maxlen = sizeof(int),
6556 .mode = 0644,
6557 .proc_handler = proc_dointvec,
6558 },
6559 {
6560 .procname = "accept_redirects",
6561 .data = &ipv6_devconf.accept_redirects,
6562 .maxlen = sizeof(int),
6563 .mode = 0644,
6564 .proc_handler = proc_dointvec,
6565 },
6566 {
6567 .procname = "autoconf",
6568 .data = &ipv6_devconf.autoconf,
6569 .maxlen = sizeof(int),
6570 .mode = 0644,
6571 .proc_handler = proc_dointvec,
6572 },
6573 {
6574 .procname = "dad_transmits",
6575 .data = &ipv6_devconf.dad_transmits,
6576 .maxlen = sizeof(int),
6577 .mode = 0644,
6578 .proc_handler = proc_dointvec,
6579 },
6580 {
6581 .procname = "router_solicitations",
6582 .data = &ipv6_devconf.rtr_solicits,
6583 .maxlen = sizeof(int),
6584 .mode = 0644,
6585 .proc_handler = proc_dointvec_minmax,
6586 .extra1 = &minus_one,
6587 },
6588 {
6589 .procname = "router_solicitation_interval",
6590 .data = &ipv6_devconf.rtr_solicit_interval,
6591 .maxlen = sizeof(int),
6592 .mode = 0644,
6593 .proc_handler = proc_dointvec_jiffies,
6594 },
6595 {
6596 .procname = "router_solicitation_max_interval",
6597 .data = &ipv6_devconf.rtr_solicit_max_interval,
6598 .maxlen = sizeof(int),
6599 .mode = 0644,
6600 .proc_handler = proc_dointvec_jiffies,
6601 },
6602 {
6603 .procname = "router_solicitation_delay",
6604 .data = &ipv6_devconf.rtr_solicit_delay,
6605 .maxlen = sizeof(int),
6606 .mode = 0644,
6607 .proc_handler = proc_dointvec_jiffies,
6608 },
6609 {
6610 .procname = "force_mld_version",
6611 .data = &ipv6_devconf.force_mld_version,
6612 .maxlen = sizeof(int),
6613 .mode = 0644,
6614 .proc_handler = proc_dointvec,
6615 },
6616 {
6617 .procname = "mldv1_unsolicited_report_interval",
6618 .data =
6619 &ipv6_devconf.mldv1_unsolicited_report_interval,
6620 .maxlen = sizeof(int),
6621 .mode = 0644,
6622 .proc_handler = proc_dointvec_ms_jiffies,
6623 },
6624 {
6625 .procname = "mldv2_unsolicited_report_interval",
6626 .data =
6627 &ipv6_devconf.mldv2_unsolicited_report_interval,
6628 .maxlen = sizeof(int),
6629 .mode = 0644,
6630 .proc_handler = proc_dointvec_ms_jiffies,
6631 },
6632 {
6633 .procname = "use_tempaddr",
6634 .data = &ipv6_devconf.use_tempaddr,
6635 .maxlen = sizeof(int),
6636 .mode = 0644,
6637 .proc_handler = proc_dointvec,
6638 },
6639 {
6640 .procname = "temp_valid_lft",
6641 .data = &ipv6_devconf.temp_valid_lft,
6642 .maxlen = sizeof(int),
6643 .mode = 0644,
6644 .proc_handler = proc_dointvec,
6645 },
6646 {
6647 .procname = "temp_prefered_lft",
6648 .data = &ipv6_devconf.temp_prefered_lft,
6649 .maxlen = sizeof(int),
6650 .mode = 0644,
6651 .proc_handler = proc_dointvec,
6652 },
6653 {
6654 .procname = "regen_max_retry",
6655 .data = &ipv6_devconf.regen_max_retry,
6656 .maxlen = sizeof(int),
6657 .mode = 0644,
6658 .proc_handler = proc_dointvec,
6659 },
6660 {
6661 .procname = "max_desync_factor",
6662 .data = &ipv6_devconf.max_desync_factor,
6663 .maxlen = sizeof(int),
6664 .mode = 0644,
6665 .proc_handler = proc_dointvec,
6666 },
6667 {
6668 .procname = "max_addresses",
6669 .data = &ipv6_devconf.max_addresses,
6670 .maxlen = sizeof(int),
6671 .mode = 0644,
6672 .proc_handler = proc_dointvec,
6673 },
6674 {
6675 .procname = "accept_ra_defrtr",
6676 .data = &ipv6_devconf.accept_ra_defrtr,
6677 .maxlen = sizeof(int),
6678 .mode = 0644,
6679 .proc_handler = proc_dointvec,
6680 },
6681 {
6682 .procname = "accept_ra_min_hop_limit",
6683 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6684 .maxlen = sizeof(int),
6685 .mode = 0644,
6686 .proc_handler = proc_dointvec,
6687 },
6688 {
6689 .procname = "accept_ra_pinfo",
6690 .data = &ipv6_devconf.accept_ra_pinfo,
6691 .maxlen = sizeof(int),
6692 .mode = 0644,
6693 .proc_handler = proc_dointvec,
6694 },
6695 #ifdef CONFIG_IPV6_ROUTER_PREF
6696 {
6697 .procname = "accept_ra_rtr_pref",
6698 .data = &ipv6_devconf.accept_ra_rtr_pref,
6699 .maxlen = sizeof(int),
6700 .mode = 0644,
6701 .proc_handler = proc_dointvec,
6702 },
6703 {
6704 .procname = "router_probe_interval",
6705 .data = &ipv6_devconf.rtr_probe_interval,
6706 .maxlen = sizeof(int),
6707 .mode = 0644,
6708 .proc_handler = proc_dointvec_jiffies,
6709 },
6710 #ifdef CONFIG_IPV6_ROUTE_INFO
6711 {
6712 .procname = "accept_ra_rt_info_min_plen",
6713 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6714 .maxlen = sizeof(int),
6715 .mode = 0644,
6716 .proc_handler = proc_dointvec,
6717 },
6718 {
6719 .procname = "accept_ra_rt_info_max_plen",
6720 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6721 .maxlen = sizeof(int),
6722 .mode = 0644,
6723 .proc_handler = proc_dointvec,
6724 },
6725 #endif
6726 #endif
6727 {
6728 .procname = "proxy_ndp",
6729 .data = &ipv6_devconf.proxy_ndp,
6730 .maxlen = sizeof(int),
6731 .mode = 0644,
6732 .proc_handler = addrconf_sysctl_proxy_ndp,
6733 },
6734 {
6735 .procname = "accept_source_route",
6736 .data = &ipv6_devconf.accept_source_route,
6737 .maxlen = sizeof(int),
6738 .mode = 0644,
6739 .proc_handler = proc_dointvec,
6740 },
6741 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6742 {
6743 .procname = "optimistic_dad",
6744 .data = &ipv6_devconf.optimistic_dad,
6745 .maxlen = sizeof(int),
6746 .mode = 0644,
6747 .proc_handler = proc_dointvec,
6748 },
6749 {
6750 .procname = "use_optimistic",
6751 .data = &ipv6_devconf.use_optimistic,
6752 .maxlen = sizeof(int),
6753 .mode = 0644,
6754 .proc_handler = proc_dointvec,
6755 },
6756 #endif
6757 #ifdef CONFIG_IPV6_MROUTE
6758 {
6759 .procname = "mc_forwarding",
6760 .data = &ipv6_devconf.mc_forwarding,
6761 .maxlen = sizeof(int),
6762 .mode = 0444,
6763 .proc_handler = proc_dointvec,
6764 },
6765 #endif
6766 {
6767 .procname = "disable_ipv6",
6768 .data = &ipv6_devconf.disable_ipv6,
6769 .maxlen = sizeof(int),
6770 .mode = 0644,
6771 .proc_handler = addrconf_sysctl_disable,
6772 },
6773 {
6774 .procname = "accept_dad",
6775 .data = &ipv6_devconf.accept_dad,
6776 .maxlen = sizeof(int),
6777 .mode = 0644,
6778 .proc_handler = proc_dointvec,
6779 },
6780 {
6781 .procname = "force_tllao",
6782 .data = &ipv6_devconf.force_tllao,
6783 .maxlen = sizeof(int),
6784 .mode = 0644,
6785 .proc_handler = proc_dointvec
6786 },
6787 {
6788 .procname = "ndisc_notify",
6789 .data = &ipv6_devconf.ndisc_notify,
6790 .maxlen = sizeof(int),
6791 .mode = 0644,
6792 .proc_handler = proc_dointvec
6793 },
6794 {
6795 .procname = "suppress_frag_ndisc",
6796 .data = &ipv6_devconf.suppress_frag_ndisc,
6797 .maxlen = sizeof(int),
6798 .mode = 0644,
6799 .proc_handler = proc_dointvec
6800 },
6801 {
6802 .procname = "accept_ra_from_local",
6803 .data = &ipv6_devconf.accept_ra_from_local,
6804 .maxlen = sizeof(int),
6805 .mode = 0644,
6806 .proc_handler = proc_dointvec,
6807 },
6808 {
6809 .procname = "accept_ra_mtu",
6810 .data = &ipv6_devconf.accept_ra_mtu,
6811 .maxlen = sizeof(int),
6812 .mode = 0644,
6813 .proc_handler = proc_dointvec,
6814 },
6815 {
6816 .procname = "stable_secret",
6817 .data = &ipv6_devconf.stable_secret,
6818 .maxlen = IPV6_MAX_STRLEN,
6819 .mode = 0600,
6820 .proc_handler = addrconf_sysctl_stable_secret,
6821 },
6822 {
6823 .procname = "use_oif_addrs_only",
6824 .data = &ipv6_devconf.use_oif_addrs_only,
6825 .maxlen = sizeof(int),
6826 .mode = 0644,
6827 .proc_handler = proc_dointvec,
6828 },
6829 {
6830 .procname = "ignore_routes_with_linkdown",
6831 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6832 .maxlen = sizeof(int),
6833 .mode = 0644,
6834 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6835 },
6836 {
6837 .procname = "drop_unicast_in_l2_multicast",
6838 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6839 .maxlen = sizeof(int),
6840 .mode = 0644,
6841 .proc_handler = proc_dointvec,
6842 },
6843 {
6844 .procname = "drop_unsolicited_na",
6845 .data = &ipv6_devconf.drop_unsolicited_na,
6846 .maxlen = sizeof(int),
6847 .mode = 0644,
6848 .proc_handler = proc_dointvec,
6849 },
6850 {
6851 .procname = "keep_addr_on_down",
6852 .data = &ipv6_devconf.keep_addr_on_down,
6853 .maxlen = sizeof(int),
6854 .mode = 0644,
6855 .proc_handler = proc_dointvec,
6856
6857 },
6858 {
6859 .procname = "seg6_enabled",
6860 .data = &ipv6_devconf.seg6_enabled,
6861 .maxlen = sizeof(int),
6862 .mode = 0644,
6863 .proc_handler = proc_dointvec,
6864 },
6865 #ifdef CONFIG_IPV6_SEG6_HMAC
6866 {
6867 .procname = "seg6_require_hmac",
6868 .data = &ipv6_devconf.seg6_require_hmac,
6869 .maxlen = sizeof(int),
6870 .mode = 0644,
6871 .proc_handler = proc_dointvec,
6872 },
6873 #endif
6874 {
6875 .procname = "enhanced_dad",
6876 .data = &ipv6_devconf.enhanced_dad,
6877 .maxlen = sizeof(int),
6878 .mode = 0644,
6879 .proc_handler = proc_dointvec,
6880 },
6881 {
6882 .procname = "addr_gen_mode",
6883 .data = &ipv6_devconf.addr_gen_mode,
6884 .maxlen = sizeof(int),
6885 .mode = 0644,
6886 .proc_handler = addrconf_sysctl_addr_gen_mode,
6887 },
6888 {
6889 .procname = "disable_policy",
6890 .data = &ipv6_devconf.disable_policy,
6891 .maxlen = sizeof(int),
6892 .mode = 0644,
6893 .proc_handler = addrconf_sysctl_disable_policy,
6894 },
6895 {
6896 .procname = "ndisc_tclass",
6897 .data = &ipv6_devconf.ndisc_tclass,
6898 .maxlen = sizeof(int),
6899 .mode = 0644,
6900 .proc_handler = proc_dointvec_minmax,
6901 .extra1 = (void *)SYSCTL_ZERO,
6902 .extra2 = (void *)&two_five_five,
6903 },
6904 {
6905 .procname = "rpl_seg_enabled",
6906 .data = &ipv6_devconf.rpl_seg_enabled,
6907 .maxlen = sizeof(int),
6908 .mode = 0644,
6909 .proc_handler = proc_dointvec,
6910 },
6911 {
6912 /* sentinel */
6913 }
6914 };
6915
6916 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6917 struct inet6_dev *idev, struct ipv6_devconf *p)
6918 {
6919 int i, ifindex;
6920 struct ctl_table *table;
6921 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6922
6923 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6924 if (!table)
6925 goto out;
6926
6927 for (i = 0; table[i].data; i++) {
6928 table[i].data += (char *)p - (char *)&ipv6_devconf;
6929 /* If one of these is already set, then it is not safe to
6930 * overwrite either of them: this makes proc_dointvec_minmax
6931 * usable.
6932 */
6933 if (!table[i].extra1 && !table[i].extra2) {
6934 table[i].extra1 = idev; /* embedded; no ref */
6935 table[i].extra2 = net;
6936 }
6937 }
6938
6939 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
6940
6941 p->sysctl_header = register_net_sysctl(net, path, table);
6942 if (!p->sysctl_header)
6943 goto free;
6944
6945 if (!strcmp(dev_name, "all"))
6946 ifindex = NETCONFA_IFINDEX_ALL;
6947 else if (!strcmp(dev_name, "default"))
6948 ifindex = NETCONFA_IFINDEX_DEFAULT;
6949 else
6950 ifindex = idev->dev->ifindex;
6951 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6952 ifindex, p);
6953 return 0;
6954
6955 free:
6956 kfree(table);
6957 out:
6958 return -ENOBUFS;
6959 }
6960
6961 static void __addrconf_sysctl_unregister(struct net *net,
6962 struct ipv6_devconf *p, int ifindex)
6963 {
6964 struct ctl_table *table;
6965
6966 if (!p->sysctl_header)
6967 return;
6968
6969 table = p->sysctl_header->ctl_table_arg;
6970 unregister_net_sysctl_table(p->sysctl_header);
6971 p->sysctl_header = NULL;
6972 kfree(table);
6973
6974 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
6975 }
6976
6977 static int addrconf_sysctl_register(struct inet6_dev *idev)
6978 {
6979 int err;
6980
6981 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6982 return -EINVAL;
6983
6984 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6985 &ndisc_ifinfo_sysctl_change);
6986 if (err)
6987 return err;
6988 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6989 idev, &idev->cnf);
6990 if (err)
6991 neigh_sysctl_unregister(idev->nd_parms);
6992
6993 return err;
6994 }
6995
6996 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6997 {
6998 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6999 idev->dev->ifindex);
7000 neigh_sysctl_unregister(idev->nd_parms);
7001 }
7002
7003
7004 #endif
7005
7006 static int __net_init addrconf_init_net(struct net *net)
7007 {
7008 int err = -ENOMEM;
7009 struct ipv6_devconf *all, *dflt;
7010
7011 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
7012 if (!all)
7013 goto err_alloc_all;
7014
7015 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
7016 if (!dflt)
7017 goto err_alloc_dflt;
7018
7019 if (IS_ENABLED(CONFIG_SYSCTL) &&
7020 sysctl_devconf_inherit_init_net == 1 && !net_eq(net, &init_net)) {
7021 memcpy(all, init_net.ipv6.devconf_all, sizeof(ipv6_devconf));
7022 memcpy(dflt, init_net.ipv6.devconf_dflt, sizeof(ipv6_devconf_dflt));
7023 }
7024
7025 /* these will be inherited by all namespaces */
7026 dflt->autoconf = ipv6_defaults.autoconf;
7027 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
7028
7029 dflt->stable_secret.initialized = false;
7030 all->stable_secret.initialized = false;
7031
7032 net->ipv6.devconf_all = all;
7033 net->ipv6.devconf_dflt = dflt;
7034
7035 #ifdef CONFIG_SYSCTL
7036 err = __addrconf_sysctl_register(net, "all", NULL, all);
7037 if (err < 0)
7038 goto err_reg_all;
7039
7040 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
7041 if (err < 0)
7042 goto err_reg_dflt;
7043 #endif
7044 return 0;
7045
7046 #ifdef CONFIG_SYSCTL
7047 err_reg_dflt:
7048 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
7049 err_reg_all:
7050 kfree(dflt);
7051 #endif
7052 err_alloc_dflt:
7053 kfree(all);
7054 err_alloc_all:
7055 return err;
7056 }
7057
7058 static void __net_exit addrconf_exit_net(struct net *net)
7059 {
7060 #ifdef CONFIG_SYSCTL
7061 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
7062 NETCONFA_IFINDEX_DEFAULT);
7063 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
7064 NETCONFA_IFINDEX_ALL);
7065 #endif
7066 kfree(net->ipv6.devconf_dflt);
7067 kfree(net->ipv6.devconf_all);
7068 }
7069
7070 static struct pernet_operations addrconf_ops = {
7071 .init = addrconf_init_net,
7072 .exit = addrconf_exit_net,
7073 };
7074
7075 static struct rtnl_af_ops inet6_ops __read_mostly = {
7076 .family = AF_INET6,
7077 .fill_link_af = inet6_fill_link_af,
7078 .get_link_af_size = inet6_get_link_af_size,
7079 .validate_link_af = inet6_validate_link_af,
7080 .set_link_af = inet6_set_link_af,
7081 };
7082
7083 /*
7084 * Init / cleanup code
7085 */
7086
7087 int __init addrconf_init(void)
7088 {
7089 struct inet6_dev *idev;
7090 int i, err;
7091
7092 err = ipv6_addr_label_init();
7093 if (err < 0) {
7094 pr_crit("%s: cannot initialize default policy table: %d\n",
7095 __func__, err);
7096 goto out;
7097 }
7098
7099 err = register_pernet_subsys(&addrconf_ops);
7100 if (err < 0)
7101 goto out_addrlabel;
7102
7103 addrconf_wq = create_workqueue("ipv6_addrconf");
7104 if (!addrconf_wq) {
7105 err = -ENOMEM;
7106 goto out_nowq;
7107 }
7108
7109 /* The addrconf netdev notifier requires that loopback_dev
7110 * has it's ipv6 private information allocated and setup
7111 * before it can bring up and give link-local addresses
7112 * to other devices which are up.
7113 *
7114 * Unfortunately, loopback_dev is not necessarily the first
7115 * entry in the global dev_base list of net devices. In fact,
7116 * it is likely to be the very last entry on that list.
7117 * So this causes the notifier registry below to try and
7118 * give link-local addresses to all devices besides loopback_dev
7119 * first, then loopback_dev, which cases all the non-loopback_dev
7120 * devices to fail to get a link-local address.
7121 *
7122 * So, as a temporary fix, allocate the ipv6 structure for
7123 * loopback_dev first by hand.
7124 * Longer term, all of the dependencies ipv6 has upon the loopback
7125 * device and it being up should be removed.
7126 */
7127 rtnl_lock();
7128 idev = ipv6_add_dev(init_net.loopback_dev);
7129 rtnl_unlock();
7130 if (IS_ERR(idev)) {
7131 err = PTR_ERR(idev);
7132 goto errlo;
7133 }
7134
7135 ip6_route_init_special_entries();
7136
7137 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7138 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
7139
7140 register_netdevice_notifier(&ipv6_dev_notf);
7141
7142 addrconf_verify();
7143
7144 rtnl_af_register(&inet6_ops);
7145
7146 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
7147 NULL, inet6_dump_ifinfo, 0);
7148 if (err < 0)
7149 goto errout;
7150
7151 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
7152 inet6_rtm_newaddr, NULL, 0);
7153 if (err < 0)
7154 goto errout;
7155 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
7156 inet6_rtm_deladdr, NULL, 0);
7157 if (err < 0)
7158 goto errout;
7159 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
7160 inet6_rtm_getaddr, inet6_dump_ifaddr,
7161 RTNL_FLAG_DOIT_UNLOCKED);
7162 if (err < 0)
7163 goto errout;
7164 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
7165 NULL, inet6_dump_ifmcaddr, 0);
7166 if (err < 0)
7167 goto errout;
7168 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
7169 NULL, inet6_dump_ifacaddr, 0);
7170 if (err < 0)
7171 goto errout;
7172 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
7173 inet6_netconf_get_devconf,
7174 inet6_netconf_dump_devconf,
7175 RTNL_FLAG_DOIT_UNLOCKED);
7176 if (err < 0)
7177 goto errout;
7178 err = ipv6_addr_label_rtnl_register();
7179 if (err < 0)
7180 goto errout;
7181
7182 return 0;
7183 errout:
7184 rtnl_unregister_all(PF_INET6);
7185 rtnl_af_unregister(&inet6_ops);
7186 unregister_netdevice_notifier(&ipv6_dev_notf);
7187 errlo:
7188 destroy_workqueue(addrconf_wq);
7189 out_nowq:
7190 unregister_pernet_subsys(&addrconf_ops);
7191 out_addrlabel:
7192 ipv6_addr_label_cleanup();
7193 out:
7194 return err;
7195 }
7196
7197 void addrconf_cleanup(void)
7198 {
7199 struct net_device *dev;
7200 int i;
7201
7202 unregister_netdevice_notifier(&ipv6_dev_notf);
7203 unregister_pernet_subsys(&addrconf_ops);
7204 ipv6_addr_label_cleanup();
7205
7206 rtnl_af_unregister(&inet6_ops);
7207
7208 rtnl_lock();
7209
7210 /* clean dev list */
7211 for_each_netdev(&init_net, dev) {
7212 if (__in6_dev_get(dev) == NULL)
7213 continue;
7214 addrconf_ifdown(dev, 1);
7215 }
7216 addrconf_ifdown(init_net.loopback_dev, 2);
7217
7218 /*
7219 * Check hash table.
7220 */
7221 spin_lock_bh(&addrconf_hash_lock);
7222 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7223 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
7224 spin_unlock_bh(&addrconf_hash_lock);
7225 cancel_delayed_work(&addr_chk_work);
7226 rtnl_unlock();
7227
7228 destroy_workqueue(addrconf_wq);
7229 }
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